The keystore created on Leodex should have the 12-word secret phrase too, I believe you'd have seen it when you first created it. If you have it, it works the same way as any Keystore secret phrase.
You can even use the Keystore from Leodex to create a new Hive Account via Inleo Signup page, if it's not already associated with one.
Of course it has the seed phrase too, but it doesn’t work to login to inleo!