thank you both for your advice!
yes I found the function to pop out a tab as window, that is already useful to move around (or have it pinned on a workspace/monitor). What it won’t provide is the full application (sidebars, (icon)navigation). What I understood that this a challenge to implement. Anyways, usecase is 80% covered with pop out windows, closing this.
Just for somebody’s reference, issue is also described here:
Option for pop-out windows to have panes as main window like file explorer and outline.