Creating Custom OpenId Provider for Oauth2 Spring

Question

I have used Oauth2 framework for authorization and access control for protecting my spring boot microservice api's. Oauth2 framework is working fine but now my Client wants a dedicated OpenId Provider for authentication purpose on top of Oauth2 framework. I have done some round of searching across Google but couldn't find much resources for implementing Own OpenId Provider for Oauth2. I have gone through many blogs and could understood that OpenId is basically used when we want to delegate the authentication from Oauth2. OpenId is created on top of Oauth2 but couldn't find much resource for activating or implementing it.

Can anyone please help me on this

My complete source code which I have done using Oauth2 with Spring Framework is as given below

oauth2-spring