Sorry for having misread your question. You can do what asked. You just need use the css editor. Here I have shown how to add extra spacing after but I could also have added spacing before. I have used point units of measurement but you can use any valid unit such as pixels.

See the link to my site below. You will find lots of information about 2022 there. Start at RH2022 About Adobe RoboHelp (grainge.org)
Classic may look easier but once you get used to the new UI, it is easier. I hate going back to Classic.
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My site www.grainge.org includes many free Authoring and RoboHelp resources that may be of help.
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