gio:menu-model-item-link (model index link)

model -- a g:menu-model object
index -- an integer for the index of the item
link -- an string for the link to query

The linked g:menu-model object, or nil.

Queries the item at position index in model for the link specified by link. If the link exists, the linked g:menu-model object is returned. If the link does not exist, nil is returned.