You just have to implement ARMv8 architecture in your SoC also nothing prevents you from extending it further with ML or GPU bits. I doubt that NVidia controll

You just have to implement ARMv8 architecture in your SoC also nothing prevents you from extending it further with ML or GPU bits. I doubt that NVidia controlled ARM will ever be so inclined to sell another architecture license ... they would rather sell you their own designed ARM chips.