Your cabinets are already to close to counterso adding a shelf will make the counters useless are you really short because I can’t see how you find the uppers to high.

the uppers look to be set up to standard height. if they are hard to reach for everyday items I would look to use one of the lower drawers for cups and dishes. that actually what we did for our son, so he would stop climbing on the counters to grab plates/bowls.