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Dear opagust,
When you open Musescore, add some "Repeats and Jumps" and export it as a musicxml file, the following code can be found in the file. It seems that the more exotic directions are just a combination of <words> and <sound> tags:
<direction placement="above">
<direction-type>
<segno default-x="-8.00" relative-y="20.00"/>
</direction-type>
<sound segno="segno"/>
</direction>
<direction placement="above">
<direction-type>
<words relative-y="20.00">D.S. al Fine</words>
</direction-type>
<sound dalsegno="segno"/>
</direction>
<direction placement="above">
<direction-type>
<words relative-y="20.00">Fine</words>
</direction-type>
<sound fine="yes"/>
</direction>
Hope this helps.
Bart