How to obtain JWT token for federated identity credentials

[sunao-uehara]

I am new to OIDC and MSAL and I am trying to implement Client Credential Flow with federated credential for Service-to-Service authentication in AKS. For my case the Identity Provider is the AKS.
I am wondering if there is example code or doc for this scenario.

I was able to get an access token from MS Identity Platform with client_id and client_secret pretty easily using the func confidential.NewCredFromSecret() and Client.AcquireTokenByCredential(). It is straight forward.
But I am having a trouble to get an assertion(JWT token), issued by IdP, to exchange with access token from MS Identity Platform.

Can anybody help? Can we use this MSAL lib to achieve it?