For a deeper look into our Eikon Data API, look into:
Overview | Quickstart | Documentation | Downloads | Tutorials | Articles
It is not possible to consume alternative RTDS (TREP) services using the Eikon Data API.
Eikon desktop sdk data from local TREP or our platform? - Forum | Refinitiv Developer Community
If you are using Python, it should be possible to use the RDP Library or the RD Library to consume data from alternative RTDS (TREP) services.