get_registered_theme_features example

if ( rest_is_field_included( "{$field}.rendered", $fields ) ) {
                $data[ $field ]['rendered'] = $theme->display( $header );
            }
        }

        $current_theme = wp_get_theme();
        if ( rest_is_field_included( 'status', $fields ) ) {
            $data['status'] = ( $this->is_same_theme( $theme, $current_theme ) ) ? 'active' : 'inactive';
        }

        if ( rest_is_field_included( 'theme_supports', $fields ) && $this->is_same_theme( $theme, $current_theme ) ) {
            foreach ( get_registered_theme_features() as $feature => $config ) {
                if ( ! is_array( $config['show_in_rest'] ) ) {
                    continue;
                }

                $name = $config['show_in_rest']['name'];

                if ( ! rest_is_field_included( "theme_supports.{$name}", $fields ) ) {
                    continue;
                }

                if ( ! current_theme_supports( $feature ) ) {