Bip39 Rust Crate. Though it takes advantage of BIP32 method you'll be able to continue to import BIP39 seeds into Electrum wallet. Also other than BIp32 There's BIP44 Edition which some wallet use to the era of seeds. Seed phrases are vital for accessing private keys, which are complex strings https://trevoreqakv.thebindingwiki.com/7794361/the_anatomy_of_a_bip39_phrase_entropy_phrases_and_security