How to share weekly schedule with other user ?

I don't understand why you want do this.

The schedule is for only this one device.

When another user can use this shelly, than is the schedule still there and activated.

You can share the device.

Or is it for a lazy person that he or she haven't to do this by its own? ?

For controlling the system I would recommend to use one account or share the needed devices.

But for your question , it's not direct possible to share the weekly schedule.

You have to copy the schedule from your device from ip/settings and the other person have to set it there with an http command.

I will search later the correct link , where a German member it explain.