[DoreenMichele]

A few thoughts:

Ask yourself how relevant the revenue figure is to the position. If it is not relevant, just use downloads as a metric for.

Be careful to frame this as past revenue, not ongoing income. Talking about it like it is ongoing income veers into conflict of interest territory where they may feel they can offer you less salary because you won't starve or where they may hesitate to hire you because you have side income and might walk at will. These are not insubstantial concerns.

If you do choose to mention it, be very, very low key about it. Keep it brief, to the point and not something that turns into a rubber necking train wreck of a detail on your resume.