Banking Apps are notorious for not wanting to run on Custom ROMs like /e/, LineageOS etc. for security reasons.
If they are that important for you, perhaps /e/ isn’t the right choice for an OS, because even if you can get them to run, there’s no guarantee it will stay that way.
That being said, you can probably install them by first installing Aurora Store, then installing the Apps from there. Aurora Store is an Open Source client for the Google Play Store, offering to get cost-free Apps from there via an anonymous account.
Here’s a topic of interest …