You are talking about making the second call to the /getuser endpoint. If you are looking to avoid this you can use the getIdTokenClaims method to retrieve the user’s profile information after the initial call where the access token and id token are issued. You can also get the raw id token with this method. Follow the doc here:
https://auth0.com/docs/libraries/auth0-spa-js#get-id-token-claims
Would that solve it?
Thanks,
Dan