The Related List is mapped in one paragraph in the template, all the Salesforce fields from the Related list are dropped into template as child elements of the paragraph. In the result document, data from list item will be presented as a separate paragraph. The paragraph and static text in it will be replicated for each line item.
3. Add more fields to template
Create a space after a dynamic field, point to the placehoder text, select the Tag tab,
The exaxmple shows when the "space" is still wrapped inside a span (with blue highlight) and when it's outside the span by using Append Space
Continue to add more fields or texts to the paragraph as you like.