yes, I did it twice, the second time I dint think I needed it though since I thought I read if you provision it on Android that where ever that info is written to is carried over to Graphene.
So the first time I followed instructions, was a bit displeased to put it mildly that I have to install google framework, but I did. I then called support at t-mobile, they deactivated my physical sim card and something borked on the esim provisioning. That left me with no way to call them back. On friends phone they said find nearest store. Still in graphene at t-mobile with google stuff installed they could not get to work.
2nd time I used Android OS for provision and it seemed to work except no data connection after installing graphene a second time. I did install the Google stuff again, even though like I said I think I didnt need it.
So pixel 8 is working now in Android, data is working, I am about to install graphene again. I'll update what happens.