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Editing a piped in stream?

Subject line is poorly phrased.
While working on a problem {solved by a different approach} I had:
   ls -l /dev/disk/by-label/ | cut -f 10,12 -d ' ' data.txt
I would then manually edit data.txt by replacing the space character between the two fields with a tab.

I suspect I should be able to do:
ls -l /dev/disk/by-label/ | cut -f 10,12 -d ' ' | *something* > prettydata.txt

I searched for examples/tutorials found that it should be conceptually possible. However the examples I found were processing streams I didn't understand.

What should I be looking for?