Jan Brodda Thanks for sharing the RegEx and good luck! I also could try making a first dashboard based on a .CSV export. Do you manage exporting the CSV files with several accounts within BunQ? Or do you have just one account?
Even better would be a live connection with BunQ. Maybe that is possible with the BUNQ API?
Thinking out loud; Maybe it is possible to export the BunQ data in realtime into Google Sheets, and within Google Data studio use that sheets as a datasource.