change link in the table.html.twig - drupal

Question

I'm working with drupal 8. I enable debug and I found [
<!-- BEGIN OUTPUT from ‘core/themes/stable/templates/dataset/table.html.twig’ --> ] then I overwrite table.html.twig in my theme folder. Now the tag include a link that I want to add [/edit] to it. to make user navigate to the edit page. the following code is from the core file.
<tbody>
{% for row in rows %}
<tr{{ row.attributes }}>
{% for cell in row.cells %}
<{{ cell.tag }}{{ cell.attributes }}>
{{- cell.content -}}
</{{ cell.tag }}>
{% endfor %}
</tr>
{% endfor %}
</tbody>
I try to create preprocess function
/* this preprocess method is to add variables to table.html.twig*/
function mytheme_preprocess_table(&$variables) {
print_r(array_keys($variables));
$variables['output'] = "add your custom";
$variables['hello'] = 'world';
}
but I don't know how to access [cell.content] in order to add [/edit]
How is the table generated? it's from the code. Where is the table displayed? in https://example.com/ar/webform/companies_form/submissions/ What is the path of "edit web form page"? webform/companies_form/submissions/3119/edit Have you debugged the template to see what variables are available in the template? yes,
Array
(
[0] => header
[1] => rows
[2] => attributes
[3] => sticky
[4] => responsive
[5] => empty
[6] => footer
[7] => caption
[8] => colgroups
[9] => theme_hook_original
[10] => title_attributes
[11] => content_attributes
[12] => title_prefix
[13] => title_suffix
[14] => db_is_active
[15] => is_admin
[16] => logged_in
[17] => user
[18] => directory
[19] => header_columns
[20] => no_striping
[21] => #cache
)