bramus, 
Just announced at #googleio : cross-document view transitions for multi-page applications are available in the upcoming Chrome 126 🎉
Expect a video (and blog post) with details to drop this Thursday.
In the meantime, check out the updated docs: https://developer.chrome.com/docs/web-platform/view-transitions
Recording of Jon Dahlke doing announcing MPA View Transitions at Google I/O.