OK, there is no such thing as fresh maraschino cherries. They are a preserved cherry, originally marasche cherries, but other types are used now. So these are preserved.
The jar says Preservative E220, a quick check on the internet gives this as sulfur dioxide. You could probably crush and press them to extract the liquid, Normally the sulfer content of must will drop in an open bucket over a day or two if it is derived from potassium metabisulphite. It may be the same for that one. I would not ferment the fruit directly, it would probably retain too much sulfur. The question would be, do you like the taste of them, or is it too fake? And the day glo red might be a bit disconcerting. But who am i to judge, I was eyeing watermelon snocone syrup yesterday.
You could also learn to love ice cream sundaes.....