This is some lead text in a paragraph with a following footnote. 1

You can also create the footnote directly from the section making it wrap in a paragraph like the footnote below this paragraph. But is best used from within a textrun.

2

Just like a textrun, a footnote can contain native texts. No break is placed after adding an element. All elements are placed inside a paragraph.
But you can insert a manual text break like above, links like PHPWord on GitHub, image like , or object like But you can only put footnote in section, not in header or footer.

The reference for this is wrapped in its own line