Add WP REST API support to certain taxonomies

gistfile2.php

/**
 * Add REST API support to an already registered taxonomy.
 */
add_filter( 'register_taxonomy_args', 'my_taxonomy_args', 10, 2 );
 
function my_taxonomy_args( $args, $taxonomy_name ) {
 
    if ( 'freebbble-type' === $taxonomy_name || 'freebbble-license' === $taxonomy_name ) {
        $args['show_in_rest'] = true;
 
        // Optionally customize the rest_base or rest_controller_class
        $args['rest_controller_class'] = 'WP_REST_Terms_Controller';
    }
 
    return $args;
}