I have seen some sheet music and instructional books which use numbers to do this, but not tab. Remember that the numbers in tablature indicate which fret , not which finger to use. Duration of notes, how long they are to be played, is indicated by horizontal spacing. Evenly spaced numbers mean that these notes are played for equal amounts of time. Closely spaced numbers suggest shorter notes, and wide spacing represents longer notes.
Many people add bar lines to their tablature, which is very helpful.
When printing out tablature, use a monospaced font such as Courier, not a proportional font. You can of course use a smaller font size if you prefer.