What can I add to my watermelon jam that will make it distinctive?

This is the first year we have grown watermelon and I’m attempting to make my first watermelon jam. Every recipe I’m finding has the same ingredients. Watermelon, lemon juice, pectin and sugar. Is there another ingredient I can had that would make it distinct from the typical recipe?

I’m also a new fan of watermelon so I’m not quite sure what other ingredients might pair well with it.