Data System Wide Lineage via API Request

I'm struggling with finding a solution. My goal is to identify all existing lineage relationships for any data objects within a specific data system they belong to. I've been using the Purview REST API (Datamap Dataplane) but I haven't found an endpoint returning data system side lineage/relationships.

For my scenario I have a Databricks metastore and need to know the existing lineage relationships of those data objects within Purview so I can purge them out when we are doing our scheduled lineage refresh.