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For OAuth2 I've always used the standard library, which is fine as long as you don't need to handle token refresh -- and assuming you're getting a JWT from an OAuth2 endpoint, I'm guessing you don't. (It can be done, but it's problematic.)
I recommend github.com/lestrrat-go/jwx for your JWT-handling needs. If you want some examples of using it, try here.
If you actually have OpenID Connect then there are some good libraries to use for token management in that case. Iirc I prefer https://github.com/coreos/go-oidc, since it supports auto discovery and key rotation etc.