Underlined Text not Converting over

[CygnusThe1st]

when I download this story as an EPUB the
underlining of the text saiki is lost
[in epub reader ReadEra]

[in site]

[mirabilos]

Same here: in the A/N intro of https://www.fanfiction.net/s/8555956

FFN: The same thing with the <span style='text-decoration:underline;'>underlining</span> of jutsu names.

HTML export: The same thing with the underlining of jutsu names.

Please at least retain these, if not convert them to <u> tags (which, I know, aren’t standard, but work-ish and can be matched on). Ideal would be converting them to <span class="underline"> with defining that class in the head, as that would allow me to configure them in the Lynx stylesheet as well.