Add an event that repeats on weekdays

For the month of July I need to add an event that repeats every weekday from 10:00 until 13:00. The Nextcloud 13.0.2 Calendar app give me a textbox “Repeat every…” but when I put “weekday” in the box it converts to “1”.

Furthermore, I must manually count how many repeats I want, there seems to be no way to tell the Calendar app to stop on a particular date.