txt2man(1) on Linux
The text f3f97d8771d1, as Debian 11 (Bullseye) shipped it.
convert flat ASCII text to man page format
Flags it lists
-
-B -
-I -
-P -
-T -
-X -
-d -
-h -
-p -
-r -
-s -
-t -
-v