Mobile app for SmarterMail XMPP chat

Does anybody have found reliable app for SmarterMail XMPP chat?

Under Android I have tried Conversations, Monocles chat, Cheogram, Moxxy but with mixed results. Moxxy worked better then others but still not reliable.

Mayby it’s possible to integrate push notifications to SmarterMail chat? Ie user installs ntfy.sh (or similar) app on mobile and will get through it notifications when new message arrives to SmarterMail chat.