How can I revoke tokens created through Cognito oauth/token url

Question

We have an application implemented on api-gateway and lambda, the authentication is carried by tokens generated on Cognito, Cognito has the Client credentials OAuth Flow with custom scopes. We are using the oauth/token url to generate access tokens, we tried to create refresh tokens, but the oauth/authorize isn't working, because the Client credential flow restrict the Authorization code grant.

On the middle of the process we need these tokens to be revoked, but the oauth/revoke needs the refresh token that we can't generate because of the chosen flow, How can we can revoke those tokens?