It's not an issue with finding a simple pointer. From what I could tell with my time spent on cheat engine the value for gravity goes through a CRC which you would have to bypass. The CRC is what inevitably stops you from freezing the value to anything you want when you do find it. So you could find the value which is simple enough, and you can even find pointers that point to that address with tools like JNoexs just as well, but you are never going to find what rewrites the correct value every time there is a mismatch (i.e. when you try to freeze the value to what you want), or find a good place to bypass it completely without a disassembler. (not unless you are incredibly talented, and that person either doesn't exist or care to look at this point.)
I don't want to go to far into the technical parts of it because in all honesty once we get this far it's well above my paygrade, but Gecko seems to be way better equipped for dealing with that kind of stuff than the simple tools we have on the switch. I don't think we are going to see a moonjump code on the switch version of the game any time soon, or until the tools themselves improve. Hopefully with such a strong homebrew scene at the moment that might eventually happen. Another option might be with the modding community. I'm not entirely sure it's as simple as a lot of the mods I do see, but there are a lot of good tools for making mods for BotW and somethings such as durability
cheats, for example are just easier to make with use of mods than with SX-OS
cheat codes.