Automated emails subject line editing - allow using clients & accounts variables

It is great that we can now edit automated emails subject lines. However, I have just found out from the support desk that clients and accounts variables cannot be used when editing automated emails subject lines. It would be useful to be able to add clients and accounts variables in subject lines. For instance: %NAME% - bookkeeping records for the month ending %BKPERIODEND%, which would then appear as XYZ Company Ltd - bookkeeping records for the month ending 31/12/2024