Flowable Keycloak Microservice Authorised call

Hello, I have a problem.
I have an application which uses Jhipster microservices (Angular + Spring Boot) and the default Flowable docker service.
I want to “integrate” the task app, in my frontend application, which means that an user should claim and complete task on my frontend application. My fronent makes a request to a microservice, which in return calls the flowable service to get/interact with Tasks.

My question is, how can I forward my frontend user’s credentials(or access token) to the Fowable service through my own proxy microservice.

I want to mention that the flowable -> keycloak integration works fine, I can create users on keycloak and authenticate an Flowable’s frontend with the respective users and I don’t have access to the user’s password.