custom-rout-res-api

<?php 
//Custom acf endpoint;
function add_acf_field_rest( $request_data ) {

    // setup query argument
    $args = array(
        'post_type' => 'cpt_territory',
        'posts_per_page' => -1
    );

    // get posts
    $posts = get_posts($args);

    // add custom field data to posts array 
    foreach ($posts as $key => $post) {
            $posts[$key]->acf = get_fields($post->ID);
    }
    return $posts;
}

// register the endpoint;
add_action( 'rest_api_init', function () {
    register_rest_route( 'my_endpoint/v2', '/cpt_territory/', array(
        'methods' => 'GET',
        'callback' => 'add_acf_field_rest',
        )
    );
});