How to start a l4t arm linux inside x86 VirtualBOX

I want to run a l4t arm linux inside VirtualBOX (ON a x86).
(Or inside docker container in x86 machine without a GPU)
Building ARM binaries inside is the purpose. Actual GPU execution will not be attempted.

( I do know how to build ARM binaries using qemu-arm-static inside x86 linux.
BUT, I want to run l4t linux in virtualbox or docker so default source compilation is COPYable to
TX2 hardware as a bulk module with dependencies or as a container. )