I don't see how the =TR function you got from the Helpdesk relates to the supply chain. But if this is what indeed you're looking for, then here's the equivalent call using Eikon Data APIs, where the values in the first argument of get_data call are PermIDs for Apple Inc. and Thomson Reuters Corp as an example.
I don't believe this data is available through Eikon Data APIs. However you may want to verify this by reaching out to Thomson Reuters Helpdesk and asking if this data can be retrieved into Excel using =TR function. If it can be retrieved into Excel using =TR function, it can also be retrieved using Eikon Data APIs and vice versa.
I am trying to get daily close price data using RIC list and the eikon get_data api is only able to return result for 2000 odd rics and throws Backend error 400 Bad Request for remaining.Is there a way to get close price data for some 6000 rics?