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At the moment it is not possibility use a hint or a button to momentarily display an aide image as per your request.
You can however use a check-box and form conditions to hide an show an image value which will come close to what you are trying to achieve.
Here is an example for I made, kindly let us know if it can work for you.
ok thanks, not really what i was hoping for, but i''l give it a try and see how it looks like
Do let us know if this will work for you, I'll keep on looking for other workarounds