Lakka dual boot with windows 7 and two hard drives

Goodmorning everyone, I have already read the previous posts on the subject and I have not been able to find an answer that perfectly suits my needs, and they are all very old so maybe in the meantime simpler solutions have come out: I have a pc with two hard drives, one has Windows 7 and one Ubuntu. I would like to keep Windows 7 and install Lakka instead of Ubuntu. Now the grub is installed in the Ubuntu drive which is set as primary on startup. Is there a way to keep the current situation, that is, to have at startup the choice of which operating system to start? Thanks!