RULES \ How To Add Rules Option

RULES \ How To Add Rules Option

Hello,

How to add rules option: FILLED, BLANK in addition to current, which IS, IS NOT, STARTS WITH, ENDS WITH?

AN EXAMPLE: Need to create Rule that allows to SHOW / HIDE lower field if upper filed is FILLED or BLANK. It's critically important option.

How to do this, in case all existant logics IS, IS NOT, STARTS WITH, ENDS WITH are not relevant?

Please explain OR ADD THIS OPTION INTO Soho Form.

Thank you.