Converting <u> tags to pandoc underline

[Triquetra]

I have some markdown in obsidian that contains <u>text</u> html underline tags. When exporting to .docx format, these underlines seem to be ignored. I created a pandoc lua filter to converts these tags to pandoc underlines, and included the filter in my "extra arguments" field in enhancing exporter for the docx format with "--lua-filter=". Here's the code:

local function underline_filter (elem)
  if elem.tag == "u" then
    return pandoc.Underline(elem.content)
  end
end

return {
  { Inline = underline_filter },
}

Although this should work. It does not. I'm at a loss for next steps here. Does anyone have some idea about how to get the html underline tags to be converted to underlines in docx? What am I missing?

[rafjaf]

In the same way, <i></i> tags do not get converted to italics in .docx