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Currently this is not possible, what you can do is adding a text and show it when the terms check box is checked, to do it only add the "Text" tool to your form:
Then add a condition, if the terms check box is filled, then show the text:
The result will be that the text will be shown when the terms check box is checked, indicating that terms have been accepted:
Here is also a guide that will help you with showing/hiding fields based on user's answers: How-to-Show-or-Hide-Fields-Base-on-User-s-Answer
Hope this helps.