How to show holes in a part's footprint without putting holes in the board?

I have a TH 21700 battery holder that has a mounting hole in the plastic in the middle of each battery compartment. I am not using the mounting hole to mount the battery holder. Instead, I plan to place a small SMD thermistor on the board where the hole is in the plastic battery holder to sense the temperature of each battery. How do I represent the hole in the footprint of the battery holder without adding a hole to the board? I need to know where the hole is in the footprint so I place the thermistor in the right place.

Put a circle on the Silk layer to represent the size of the hole . . . or if you don’t want that shown on the silk layer put it on one of the User layers.

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