This is a difficult question to google, as the term "outline" does not mean the same in Inkscape as it does in, e.g., Powerpoint.
However, Powerpoint does not support Latex.
How can I outline a LaTeX word generated with the "Tex Text" extension so that it is clear when placed over an underlying figure?
Here is a picture of what I would I have tried (and a link to the inkscape svg file:
dvisvgm
to get svg files.