I will look into it tomorrow. Quick google search says Chirp is not compatible with DMR, even if the radio is capable of analog, but that was a couple posts from 2020. Maybe things have changed?
I thought I saw your radio listed:
I'll try to remember to dig out the laptop I use for that and see if it shows up on the list when I update to the latest version.
The 778 is in the list, 878 is not. You'll have to use whatever software Anytone has to program it.