Is there a way to restrict custom properties to only selected values?

I’m making a parametric table and I use a custom property in a driver for a shape key. Since the file will be used by other people than me, I’d like the height property for example to only be 29, 36 or 42. No in betweens.

Is this possible?

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I need this answer too.

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I dont want to open new thread for same question i hope somebody have answer.