Arc with arrows

You can edit arrowheads, though be warned, its not very intuitive. Before you do though, edit that is, take one that is closest to what you want and save it to a new preset.

Go to Object Properties, Arrowheads, see the three dots to the right of the dropdown. Click there, and New. Unfortunately the new came you give it will be overwritten by Draw, but you'll find it right at the bottom of the list. Then you can edit it. Unfortunately theres no precision involved, indeed the units are set to pt's when they should be mm. Have a play and report back.

The best i get by changing the attributes is this:

And thats not exaclty what i want. I can edit the points of the arc by manually moving them till it fits but thats not an accurate solution.

Hello Enclave; You could draw your own.

George