@PurnimaJaiswal-8418 The job id is in the response of your healthcare analysis job when you send a request and receive 202 accepted response.
This job id is used in the GET call to get healthcare analysis job status and results. The sample response of this request is mentioned in the reference.
Once you receive access to use this preview version of the API you can call the API directly from Azure or run on-premise with the container. Running the container for health is the same process as other features used for text analytics. Once the pre-reqs are satisfied your container can be hosted on Azure if required.
With respect to the entities the GET call for job status does not have a filter for a particular type of entity, the available parameters are documented in the reference page of this API.
I think to process only certain entities for health you can handle this client side in your application to display response of EXAMINATION entity only. As this is a JSON response the application should be able to filter the objects and display the required details. Hope this helps!!