You can achieve only an approximation of your requirement, something like:
Goofy.........................14
Pluto.....................4,6,12
Scrooge McDuck....2,12,15,18,19,
21,56,59,65,83,88,99
The trick is to change alignment in Index 1 paragraph style (and perhaps also in Index 2 and Index 3 if you have multi-level index keys) to Right.
Note that the index machinery will try to fill lines as much as possible; it will not try to balance lines. Thus you may end up with
Goofy.........................14
Pluto.....................4,6,12
Scrooge McDuck.2,12,15,18,19,21,
56
There are slight improvements playing with indents (Before and First Line) but this requires two tabs in the entry line to defeat right alignment for the key and may have adverse effects with long keys.
Don’t hesitate to edit your question or comment if you need more details.
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