Allegedly, these are manufactured by TCL, and are similar but not exactly the same as the TCL 10 5G.
To gain any chance of obtain an unofficial build, request should be formatted like this.
Anyway: no (re)sources, no party.
Suggestion: try GSIs instead.
Thank you for the request formatting example. I haven’t been able to find any resources for this phone, which seems odd because it’s meant to be affordable, so I would expect it to be a commonly used device. I’ll keep looking. What is a GSI?
Also, should I reformat this post or create a new one?
Never mind the formatting. Try a 
Search Revvl 5g instead.
Unfortunately the search here brings up similar named devices is why you need the device codename, mentioned in link below, and regarding T-mobile did you check if the phone has an unlockable bootloader?
We are only asked to present requests as
GSI is Generic System Image. GSI search