Right now, we have 2 challenges:
Rest connection does not support content type multipart/mixed
There is no easy way to create the Batch call itself.
For point 1, this is a restriction in the rest component that could be just lifted. For point 2, it might require changes to the TableLoop or LoopJob components (combined with paging) to make it work.
https://mscrm16tech.com/2021/01/28/batch-operation-batch-using-odata-api-dynamics-365/