REST API for Projects and Tasks to post the Debrief Lines

Summary:

We are using Service Logistics REST service debriefs/{debriefHeaderId}/child/lines in OIC program to create Debrief Transactions in Service Logistics > Manage Charges and Estimates when the activity is completed in Field Service. We are now planning to add Project Details (e.g. Project Number, Task, and Expenditure Item etc.) through the OIC program. Which REST service will be used to cater this requirement? Also, what is the out of the box solution to maintain project details on Service Work Order from where we can get the project details in OIC program payload when posting the charges in Service Logistics?