Custom Post Type setup

Question

Desired behavior:

Custom Post Type slug: researchers, students, collaborators
URL: http://domainexample.com/people/researchers, http://domainexample.com/people/students, http://domainexample.com/people/collaborators
Template File: archive-people.php

How should I setup my Custom Post Type to achieve this behavior?
And I wanted to do it without using Taxonomies.
Possible?

Tried to set the has_archive slug and the rewrite slug to people/researchers, and the posts are loaded although the loaded template file still falls to arquive.php.

Current 'researchers' Custom Post Type registration code:

$args = array(
    "label" => __( "Researchers", "" ),
    "labels" => $labels,
    "description" => "",
    "public" => true,
    "publicly_queryable" => true,
    "show_ui" => true,
    "show_in_rest" => true,
    "rest_base" => "",
    "has_archive" => "people/researchers",
    "show_in_menu" => true,
    "exclude_from_search" => false,
    "capability_type" => "post",
    "map_meta_cap" => true,
    "hierarchical" => false,
    "rewrite" => array( "slug" => "people/researchers", "with_front" => true ),
    "query_var" => true,
    "supports" => array( "title" ),
);
register_post_type("researchers", $args);

Thank you

Answer 1

You can set any arbitrary path in the rewrite slug and has_archive arguments:

$args = array(
    'rewrite'     => array('slug' => 'people/researchers'),
    'has_archive' => 'people/researchers',
    // other args...
);

EDIT

Your post type slug is researchers, so WordPress will be looking for the file archive-researchers.php by default. If you want to force a different template, you can use the archive_template filter:

function wpd_researchers_archive_template( $archive_template ){
     if( is_post_type_archive( 'researchers' ) ){
          $archive_template = locate_template( 'archive-people.php' );
     }
     return $archive_template;
}
add_filter( 'archive_template', 'wpd_researchers_archive_template' );