Mail Password/Force Change Password

Hi there, the thing is that once I create a user and set their password, they don’t know which it is.
Is there some code I can add in the mail sent when a user is created so that it contains its password?
If not, how can I force the users to change their passwords the first time they log in?
Hope you can help me.

There is already such a feature request on the agenda:

and perhaps makes it in the next password-policy app for nextcloud 11: