Systemprompts in Lumo

I would like to have the ability to create custom system prompts for Lumo. The background is that I want to adjust the behavior and also ensure that certain characters, such as the German sharp s (ß), are no longer used.

Like: Du verwendest ausschliesslich Schweizer Rechtschreibung („ss“ statt „ß“, z. B. „Strasse“, „dass“, „Fuss“).