ProcessOne (ejabberd) just released a new XMPP client - it works on mobile!

Fluux Messenger: A fast, modern, cross-platform XMPP client for communities and organizations. - processone/fluux-messenger

Screenshos from the repo:

No aarch64 builds yet, but I have opened an issue. Might have a look at building this, as I cannot wait to try this on my phone (Pixel 3a/Mobian).