Yeah, maraschino and jalapeño sounds odd together, but it's cool that it works! I'm surprised that the maple syrup wasn't too much, but it sounds delicious since it worked!
This reminds me of the yellow pepper no 2. I haven't made it in a while but it uses yellow bell peppers for the juice and then you scorch a shishito pepper for garnish. It's surprisingly good! I love when savory elements add that little something extra.