I think Wells Fargo actually did used to have their own Android Pay alternative within their own app, but they've discontinued it, and now you have to add their cards directly into Google Pay.
If you go into "Settings", "Apps & notifications", "Advanced": "Default apps", "Tap & pay", then you can select either "Google Pay" or another app that you may have. I think "Wells Fargo" app used to show up there back when they supported contactless within their app.
https://developer.android.com/guide/topics/connectivity/nfc/...
That said, I've seen exactly once someone using and Android phone to pay contactless. It was a huge pain, they tried multiple times.
Samsung Pay's Magnetic Stripe Emulation is much cooler, it's like magic. Unfortunately, magnetic stripes are a legacy tech.