How to use lv_menu exit/back button in some lv_group


I want to use lv_menu with nested submenus. To naviagte between them I want to use LV_INDEV_TYPE_KEYPAD input-device which should use groups. But in this case menu exit/back-button should be assigned in all groups (group in which main page elements should be included, groups for submenu elements). But if I call lv_group_add_obj() for back-button it removes from previous group. How to include back-button into more than one group? Or maybe there is another way to solve this problem?

What LVGL version are you using?