Adding graphql support for custom posts - wp-graphql

Question

I have installed WP GraphQL plugin and it works fine for pages and posts. However its not working for custom posts.
for example,
query getPages{
pages(first: 1000) {
edges {
node {
uri
}
}
}
}
works.
query getPastEvents{
past-events(first: 1000) {
edges {
node {
uri
}
}
}
}
not works.
I have read this doc https://www.wpgraphql.com/docs/custom-post-types/ but still not understood exact process.
update: i added the below code in wp-includes/plugin.php and its now showing careCenter, careCenterPages in WP GraphQL IDE but its returning no data
// WP GRAPH QL
add_action( 'init', function() {
register_post_type( 'care_center', [
'show_ui' => true,
'labels' => [
//#see https://developer.wordpress.org/themes/functionality/internationalization/
'menu_name' => __( 'CareCenter', 'care_center' ),
],
'show_in_graphql' => true,
'hierarchical' => true,
'graphql_single_name' => 'careCenter',
'graphql_plural_name' => 'careCenterPages',
] );
} );
add_filter( 'register_post_type_args', function( $args, $post_type ) {
// Change this to the post type you are adding support for
if ( 'care_center' === $post_type ) {
$args['show_in_graphql'] = true;
$args['graphql_single_name'] = 'careCenter';
$args['graphql_plural_name'] = 'careCenterPages';
}
return $args;
}, 10, 2 );
am attaching few screenshots below for more understanding...
I want graphql support for custom posts just like pages & posts.