@romo Sorry, I don't know this tool, but from what I've researched, I believe it's not possible.

Recalbox is an operating system focused on retro-emulation, you can only run the games that there are emulators available, see the list of emulators at this link:
https://wiki.recalbox.com/en/hardware-compatibility/emulators-compatibility

If you create a game in some format recognized by these emulators, it will work, if not, it will not work.

Recalbox 6.1

I should warn you that we don't support outdated versions, so I recommend using the latest official version if you need any kind of support.