Update Parent post type in child theme - wordpress

Question

I'm developing a child theme of a premium template, this comes with a custom post type with the label name of "release" but I'd like to change it to something else, I know that if I go to the functions.php file of the main theme I can change it easily but I'd like to change it from my child theme?
here is the code
<?php
add_action('init', 'kentha_release_register_type');
if(!function_exists('kentha_release_register_type')){
function kentha_release_register_type() {
$labelsrelease = array(
'name' => esc_html__("Release",'kentha'),
'singular_name' => esc_html__("Release",'kentha'),
'add_new' => esc_html__("Add new",'kentha'),
'add_new_item' => esc_html__("Add new release",'kentha'),
'edit_item' => esc_html__("Edit release",'kentha'),
'new_item' => esc_html__("New release",'kentha'),
'all_items' => esc_html__("All releases",'kentha'),
'view_item' => esc_html__("View release",'kentha'),
'search_items' => esc_html__("Search release",'kentha'),
'not_found' => esc_html__("No releases found",'kentha'),
'not_found_in_trash' => esc_html__("No releases found in trash",'kentha'),
'menu_name' => esc_html__("Album releases",'kentha')
);
$args = array(
'labels' => $labelsrelease,
'public' => true,
'publicly_queryable' => true,
'show_ui' => true,
'show_in_menu' => true,
'query_var' => true,
'rewrite' => true,
'capability_type' => 'page',
'has_archive' => true,
'hierarchical' => false,
'menu_position' => 40,
'page-attributes' => true,
'show_in_nav_menus' => true,
'show_in_admin_bar' => true,
'show_in_menu' => true,
'menu_icon' => 'dashicons-controls-play',
'supports' => array('title', 'thumbnail','editor', 'page-attributes' )
);
if (function_exists('ttg_custom_post_type')){
ttg_custom_post_type( "release" , $args );
}
/* ============= create custom taxonomy for the releases ==========================*/
$labels = array(
'name' => __( 'Release genres','kentha' ),
'singular_name' => esc_html__( 'Genre','kentha' ),
'search_items' => esc_html__( 'Search by genre','kentha' ),
'popular_items' => esc_html__( 'Popular genres','kentha' ),
'all_items' => esc_html__( 'All releases','kentha' ),
'parent_item' => null,
'parent_item_colon' => null,
'edit_item' => esc_html__( 'Edit genre','kentha' ),
'update_item' => esc_html__( 'Update genre','kentha' ),
'add_new_item' => esc_html__( 'Add New genre','kentha' ),
'new_item_name' => esc_html__( 'New genre Name','kentha' ),
'separate_items_with_commas' => esc_html__( 'Separate genres with commas','kentha' ),
'add_or_remove_items' => esc_html__( 'Add or remove genres','kentha' ),
'choose_from_most_used' => esc_html__( 'Choose from the most used genres','kentha' ),
'menu_name' => esc_html__( 'Music genres','kentha' ),
);
$args = array(
'hierarchical' => true,
'labels' => $labels,
'show_ui' => true,
'update_count_callback' => '_update_post_term_count',
'query_var' => true,
'rewrite' => array( 'slug' => 'genre' ),
);
if(function_exists('ttg_custom_taxonomy')){
ttg_custom_taxonomy('genre','release',$args );
}
$fields = array(
array( // Repeatable & Sortable Text inputs
'label' => esc_html__( 'Release Tracks','kentha' ), // <label>
'desc' => esc_html__( 'Add one for each track in the release','kentha' ), // description
'id' => 'track_repeatable', // field id and name
'type' => 'repeatable', // type of field
'sanitizer' => array( // array of sanitizers with matching kets to next array
'featured' => 'meta_box_santitize_boolean',
'title' => 'sanitize_text_field',
'desc' => 'wp_kses_data'
),
'repeatable_fields' => array ( // array of fields to be repeated
'releasetrack_mp3_demo' => array(
'label' => esc_html__( 'MP3 Demo','kentha' ),
'desc' => esc_html__( '(Never upload your full quality tracks, someone can steal them)','kentha' ), // description
'id' => 'releasetrack_mp3_demo',
'type' => 'file'
),
'releasetrack_track_title' => array(
'label' => esc_html__( 'Title','kentha' ),
'id' => 'releasetrack_track_title',
'type' => 'text'
),
'releasetrack_artist_name' => array(
'label' => esc_html__( 'Artists','kentha' ),
'desc' => esc_html__( '(All artists separated bu comma)','kentha' ), // description
'id' => 'releasetrack_artist_name',
'type' => 'text'
),
'releasetrack_buy_url' => array(
'label' => esc_html__( 'Track Buy link','kentha' ),
'desc' => esc_html__( 'A link to buy the single track','kentha' ), // description
'id' => 'releasetrack_buyurl',
'type' => 'text'
),
'icon_type' => array(
'label' => esc_html__( 'Track icon (cart icon is default)','kentha' ),
'id' => 'icon_type',
'type' => 'select',
'default' => 'cart',
'options' => array(
array('label' => 'cart','value' => 'cart'),
array('label' => 'download','value' => 'download')
)
),
)
)
);
$fields_links = array(
array( // Repeatable & Sortable Text inputs
'label' => esc_html__( 'Custom Buy Links','kentha' ), // <label>
'desc' => esc_html__( 'Add one for each link to external websites','kentha' ), // description
'id' => 'track_repeatablebuylinks', // field id and name
'type' => 'repeatable', // type of field
'sanitizer' => array( // array of sanitizers with matching kets to next array
'featured' => 'meta_box_santitize_boolean',
'title' => 'sanitize_text_field',
'desc' => 'wp_kses_data'
),
'repeatable_fields' => array ( // array of fields to be repeated
'custom_buylink_anchor' => array(
'label' => esc_html__( 'Custom Buy Text','kentha' ),
'desc' => esc_html__( '(example: Itunes, Beatport, Trackitdown)','kentha' ),
'id' => 'cbuylink_anchor',
'type' => 'text'
),
'custom_buylink_url' => array(
'label' => esc_html__('Custom Buy URL','kentha' ),
'desc' => esc_html__( '(example: http://...)','kentha' ), // description
'id' => 'cbuylink_url',
'type' => 'text'
)
)
)
);
$fields_release = array(
array(
'label' => esc_html__('Main artist', "kentha"),
'id' => 'releasetrack_artist',
'type' => 'post_chosen',
'posttype' => 'artist'
),
array(
'label' => esc_html__( 'Label','kentha' ),
'id' => 'general_release_details_label',
'type' => 'text'
),
array(
'label' =>esc_html__( 'Release date (YYYY-MM-DD)','kentha' ) ,
'id' => 'general_release_details_release_date',
'type' => 'date'
),
array(
'label' => esc_html__( 'Catalog Number','kentha' ),
'id' => 'general_release_details_catalognumber',
'type' => 'text'
)
);
$details_box = new custom_add_meta_box( 'release_details', 'Release Details', $fields_release, 'release', true );
$sample_box = new custom_add_meta_box( 'release_tracks', 'Release Tracks', $fields, 'release', true );
$buylinks_box = new custom_add_meta_box( 'release_buylinkss', 'Custom Buy Links', $fields_links, 'release', true );
}}
I need to update in Child Teme the icon_type options adding this extra fields
array('label' => 'spotify','value' => 'spotify')
Any suggestion?
Thanks in advance