This would be a very good feature to help transfer saves between switch, phone, PC and other consoles. It could be used for example to switch from PC to a handheld device for a long car trip then putting it back on later.
I was just coming here to see if this has ever been suggested. It used to be easy to transfer a save between desktop and mobile, but recent Android updates have made it virtually impossible to move files to and from android/data. I'm imagining a save import/export option for mobile and desktop versions of the game, but any way to be able to play the same file on both my PC and phone would be welcome