There is a trick to do that: at the end of each line type a dot (or any other character), then apply negative kerning to the insertion point between the 'real' last character (colon, T, N) and the following dot.
You can make those characters invisible by applying the Paper colour.
Problem is of course that those dots appear in the table of contents, so you'll have to delete them there after you generate the TOC.
This is a variant of forcing letters out of the frame on the left in left-aligned text. There you can use invisible characters (such as a discretionary hyphen) for the dummy characters, but unfortunately that doesn't work in right-aligned text.
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