Request to share app outside this account for already published app

One question regrading testing my already live published app by users who are outside my user group???
Like let say I developed a new feature that I want to be tested by some public user/outside my user group. What’s the mechanism do that?
There is an option “Request to share this app outside this account” but as far as i know this is for application that is not published.
But as i said my app is already published and we develop new feature . We want to test this new feature outside our user group.