Using OIDC method, how to get the Claims from AzureAD and 3rd party REST API

In KeyCloak Identify Providers, I’ve configured to get the users from AzureAD using OIDC method but the user role is from another 3rd party REST API.
So after Keycloak get the user from AzureAD via OIDC method, it need get the role from 3rd party REST API then put the user and role in the same ID Token.
My question is how I can configure in Keycloak Identify Provider (or somewhere else) to get the role from the 3rd party? I can’t find the option in the Identity Provider Mappers in the attached screenshot. Please help. Thanks.