The Plaintiff in any Action in any of the Superior Courts, except Replevin and Ejectment, may endorse upon the Writ and Copy to be served a Notice that the Plaintiff intends to claim a Writ of Mandamus, and the Plaintiff may thereupon claim in the Declaration, either together with any other Demand which may now be enforced in such Action, or separately, a Writ of Mandamus commanding the Defendant to fulfil any Duty in the Fulfilment of which the Plaintiff is personally interested.