360 Rise Javascript Resume

Using Windows Server 2019, IIS 10.0, no LMS. I'm very close to controlling and maintaing the data sets for the 360 Rise using the export option of CMI5 & custom javascript. However, if there's 6 lessons and the student leaves after completing lesson 1, I'd like them to resume with lesson 1 showing as complete. I can pass the endpoint, auth & actor verbs & values in the URL. What else can I pass in the URL and/or create an XML or Json file for that student that 360 Rise can read based on the endpoint in order to accomplish my objective?