Thank you for your query and for using DataDear.
I am assuming you are using the Xero - Smart Profit and Loss Report template.
If you look at column B " Accounts Code" you can see what accounts make up the line Foreign Currency Gains and Losses. In the screen below these are accounts 497, 498 and 499.
If you run a Trial Balance multiple periods report for the same period you now see the accounts split as requested. To include this in your reporting you can use Sumif formulas to total up the Realised Gains and Unrealised Gains separately for a given period.
Hope this helps and please let me know should you require anything further.