I think you need to use a microflow to identify the records matching your criteria. Create a temporary entity, with associations to your account entity (so you can link the record to the current user) and a reference set to your main entity (so you can link the results of your search to the temporary entity record).
In your microflow, retrieve or create a temporary entity record linked to the current user. Perform a search of your main entity on the date criteria. Set the reference set association on your temporary entity to the search results. You can then display the temporary entity record in a data view containing a data grid of the search results. Give me a call tomorrow Paul if you need further details or want to see how this works
Any reason why this Xpath constraint would not function?
[Datum >= '[%BeginOfCurrentWeek%]' ]
[Datum <= '[%EndOfCurrentWeek%] + 3 * [%WeekLength%]']