missing @return docs for hook_i18n_string_info()

hi all.

i have a module that supply a text input to the user and now i'd like to expose that string to the i18n module.
i read some documentation but it is still a little bit unclear to me.

i tried to implement hook_i18n_string_info() and now i see my custom group in config/regional/translate/i18n_string.

function my_module_i18n_string_info() {
	$groups['global_filter'] = array(
		'title' => t('My module'),
		'description' => t('My module labels.'),
		'format' => FALSE,
		'list' => TRUE
	);
	
	return $groups;
}

then i guess i have to implement hook_i18n_string_refresh() somehow to let the refresh strings button list my strings listed in config/regional/translate/translate, am i right?

i also saw hook_i18n_object_info() but the documentation seems to lack specifications on this hook...

can i have some hints on how to proceed?
thanks a lot!