NooB needing step-by-step guidance on building AOSP TV
I would like to build Android (10) TV for a Libre Computer (Firefly) ROC-RK3399-PC dev board that I have but I currently don't know which way is up. Firefly has some good how-tos on how to build Android, but not Android TV. Is it a build option? Are there additional libraries needed? I have been Googling for longer than I care to admit and have not found an answer or a guide.
I honestly don't know where to start and I'm sure it is easier than I'm making it in my head.
Is there some guide or step-by-step I can follow that someone here could recommend?
Understanding the device target options and how to bring in device drivers would be helpful as well.