Ion-datetime starting day of week to match locale in ionic v6

Using ion-datetime in ionic 6.0.0-beta.1 with locale set to German with:
<ion-datetime locale="de-DE" presentation="date"></ion-datetime>

That shows up as:

Is there any way to set the first day of the week to be Monday in the GUI? Sunday is not the first day of week in Germany. Our users keep picking the wrong day because they visually pick the first date in the row assuming it is Monday, when in fact it is Sunday in this date picker