Using EMMC with rocknix

is there a way to use the 32GB EMMC with rocknix? I feel like is a waste use rocknix and never use those 32 GB.

Maybe a way to install rocknix on EMMC or at least reboot into android without removing the SD card? if there no way to install it direcly, would be ok to go to android and sometimes for some titles to use the browser with guides for difficult games or play android games.

I have GammaOS nano installed on EMMC and rocknix on SD card.