There is, it's open source and works. I have have this running on my phone in the background and it has alerted me a few times like when my phone was in the loc

There is, it's open source and works. I have have this running on my phone in the background and it has alerted me a few times like when my phone was in the locker at the gym and someones airtags was in a locker close to mine. https://github.com/seemoo-lab/AirGuard https://github.com/seemoo-lab/AirGuard