That's an unusual request. I presume that the person in question understands the limits of the role of chair of a parish council? There should be no delegated authority and all decisions should be agreed by the members as a whole. The chair is simply the person who oversees the meetings. It isn't akin to the election of a party leader.
The agenda for the annual meeting is long enough already, particularly in an election year, so to avoid an all-nighter, I'd be inclined to say no.