Although I've never tried it to be able to vouch for how well/easily it works, you can reverse a prime lens and use it for macro shots. I always forget about this until after it's too late so I've not got around to putting it to the test. Now I'm tempted to see if I can improvise one for mobile too...
Here's a link that has more info: https://digital-photography-school.com/reverse-mounting-your-prime-lenses-for-affordable-macro-photography/
Yeah I knew about this too. I opted for macro filters as I was too worried that I would harm my lens.
But depth of field is too low and you miss out a lot. But mobile camera offers very high magnification and good enough depth of field too if properly done. And the lense is too small to damage LOL.