@IoannisG
Thank you for reaching out to us.
I checked and found that the LSEG Workspace - Excel supports the following functions: RDP.Data, RDP.HistoricalPricing, and RDP.Search. For the RDP.Data and RDP.HistoricalPricing functions, you can use the Build Formula windows to build the formulas for you.
Moreover, you can use the Workspace - Microsoft Office Help to search for more information or contact the support team.