Here is a fairly recent thread (January 2021) that may have some useful references for you:
EUR/USD X-Currency Swap Risks (XVA) (General Forum)
You can also Google online with a focus on some of the large consulting firms (e.g. Deloitte, PWC, etc) - you will find a number of white papers and guides to XVA that way. Risk.net is useful, but expensive - if you are working, you may have access through your employer/group - worth an ask.