How to apply font style and html tag to dynamic data list's form template?

[旻 吴, modificado hace 2 meses.]

Hello everyone. I am looking for the right way to apply font styles and html tags to dynamic data list's form template.
For example, I would like a ddm-paragraph to be shown as:
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ddm-paragraph
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1. line 1 <br>
2. line 2 <br>
3. line 3 <br>
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How could I do it? Thank you very much.