This is amazing!
You could set it via an automation to trigger a event on a certain time such as changing the account linked to a card...
Too bad there is no output of the balance in the Show Balance Of Account X... But the good news is: you can automate top up!!!
First perform the action by hand, then go to the shortcut-app and find bunq amongst the apps.
Can confirm Dutch phrases on iOS 13 (second beta) as well...