No, sorry. You can't do that, unless you modify the extension's code.
You could use some CSS to add spaces or some borders between the fields of the CheckboxList, but you can't add more text or have complex modifications in the layout.
then it is possible to divide the values or put bold, or perhaps a title that has no check box.
I need to separate or group them in some way but in the same field
Please any idea?
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That can be done using CSS and, if required to add some text, separator fields.
You can address each checkbox field from a checkbox list by it's ID.
And you can use "position" and "margin" attributes to position the separator fields in a desired place.
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