You can try using BiglyBT on android following these instructions: https://github.com/BiglySoftware/BiglyBT/wiki/I2P#user-content-biglybt-i2p-and-android
Otherwise, I’d suggest using a desktop to run i2psnark, BiglyBT, or qBittorrent and use i2pd along with those clients.
Then you can register a “domain” on reg.i2p with something like yourname.i2p as well.