Can Z Probe Offset be in relative units?

I have an ender 3 running marlin 2 and op 1.5.3. Trying to add usb keyboard commands.

Can I call relative units prior to Z probe offset so two keys could move this up and down as opposed to using preset discrete values? Maybe theres a way to get the current value and go from there but above my ability.

Keys are easier than menu. I got a key for store settings too.

There is the baby stepping commands:

M851 is the probe offset command, that doesn't have a relative mode as far as I know. The M290 for babystepping is relative.

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Thanks... it works great...

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