Use Custom Domain instead of Canonical Domain in Auth0 Dashboard API Test page

We are using a custom domain for one of our Auth0 tenants.

We have multiple APIs setup to consume m2m Auth0 Access Tokens.

We need to use the custom domain for the m2m Auth0 Access Token (as the issuer).

When using Postman to test the API, the m2m Auth0 Access Token is required.

At present, the Auth0 Dashboard API Test page only generates sample code (and tokens) using the default canonical domain.

Is there a way to get the Auth0 Dashboard API Test page to use the custom domain instead of the canonical domain?