There is no way to do it within default or placeholder values.
You can however create a custom calendar to hack this.
Change any text/color option on the calendar element to 0 opacity. This way your calender is available to interact but not actually visible. Overlay a calender icon on top of this calendar element. This would server as a icon that you can click to see the dates.
On the left of this group of icon+calendar element, place a text whose value is Date time picker’s value formatted as Fre, 01.03.24 : lowercase.
You can probably create a reusable element and use it all over your app.