_add_block_template_info() WordPress Function

function _add_block_template_info( $template_item ) {
	if ( ! WP_Theme_JSON_Resolver::theme_has_support() ) {
		return $template_item;
	}

	$theme_data = WP_Theme_JSON_Resolver::get_theme_data()->get_custom_templates();
	if ( isset( $theme_data[ $template_item['slug'] ] ) ) {
		$template_item['title']     = $theme_data[ $template_item['slug'] ]['title'];
		$template_item['postTypes'] = $theme_data[ $template_item['slug'] ]['postTypes'];
	}

	return $template_item;
}