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Unfortunately, it is not possible to add a sub label text on the check box field. It might not be the same with the sub label but you can use the "Hover text" instead?
However, I have a workaround in mind that you may used:
1. First, create an HTML code that will be used in your check box label and sub label. In my case, this is what I am using:
<p>Main Label</p><sub>Sub label</sub>
2. Paste it on your check box's label. I set the label align to top.
3. This is how it looks like: https://form.jotform.com/60275130071948
However, every time you edit the label on that check box, the HTML code will be stripped. You need to paste the HTML code again.
If you want to have a sub label on each option in the check box field, then the same approach can be applied, only difference is that you are adding the HTML code in the "Options" list.
Let us know if that works.
Is it possible to make the text smaller or a different color for this sub
You can inject this css code to change the color of the sub-label and make the text smaller.
You can change the color to any color you prefer. To change the height, simply change the value of the font-size.
Here's a guide on how to inject css code: How to Inject Custom CSS Codes