Oh, I haven't tested that actually. I can look into it. Does it work when you're browsing in Safari?
Edit: It seems like Safari extensions are disabled on iOS/iPadOS in PWA mode. Password managers work, but ad blockers, userscripts e.t.c. do not. Maybe my Google-fu is just weak, but I couldn't find much information about it other than what I see myself when testing on my own device. I'll keep looking, but if you find something yourself, please give me a shout.
Noki