How to integrate the messages of C4C non - standard objects into SAP jam

We have integrated SAP jam in C4C. The message of standard object is directly integrated into jam. Now we have created a non-standard object, and also need to integrate the message into jam. How do we do it? We think of the api:post https://developer.sapjam.com/api/v1/OData/FeedEntries using SAP jam, but we don't know how to get the jam token of the current user in C4C. Is there any other way to integrate it?