So I've got myself an rpi4b 8gb and loaded lineage OS Android 10 TV rom onto it, it runs decent, streaming apps work well on it with my remote, I've attached the TV HAT onto it now, and I'm just wondering if there is anyway to get this working using this rom somehow? If so how or where do you think I could find out how to do this?
Use Kodi (or better still, LibreELEC).
https://magpi.raspberrypi.org/articles/raspberry-pi-tv-hat-kodi <-- Scroll down to "Using Kodi"
NOTE: If you live in US/Canada, take note that DVB-T tuner is meant for the European market and will not work in North America. For USA, you need an ATSC tuner.