Checkboxes - Pop a message when checkbox is clicked

Hey team!

Hoping this will be a quick and easy feature to implement in the new OP Pages builder! 

Currently, there is a validation message which can be popped when a field is required and the form submission is attempted without the required field being filled. 

Conversely, I would like a feature which pops a small message simply when a checkbox is clicked, regardless of if it's required or not. 

Hoping this will be a quick and easy one! Thanks in advance for your time and consideration!