Screen sharing - share a browser tab directly

Hello,
We are using Jitsi Iframe API in our web application for audio/video/screenshare with logged-in users and it is working well. But now we have a requirement that during a screen share, we do not need the popup to select a window ,application or browser tab.
It should start sharing our web application browser tab directly on initiate of screen share without having the end user select it manually using the extension popup.
Is there any way to achieve this?
I found an option in config.js -> _desktopSharingSourceDevice
(If set, will attempt to use the provided video input device label when triggering a screenshare…) but it is not working.
Thanks in advance for any help!