You could re-chart so you have repeats ||: ...... :||
We allow putting 2x, 3x or 10x etc. at the closing repeat in staff text, and combined with repeating the tune at 20 it should work for you. Chart it so it has to play the repeat bars a number of times before it will finish that chorus, then the Player controls repeat will continue to the second chorus. Even setting it at 4x and 20 it will give you 80 times through. (I have not tested it to see what happens. And it will need to calculate longer when you press Play.)
And you can use the Rehearsal symbol In (for Introduction) at the beginning if you need one before the repeating starts. Tagged with In, it does not repeat the introduction each time through. (Use a rehearsal A at the start of the repeated bars so it knows where the introduction ends.)
See:
http://www.irealb.com/support/manuals/ios-manual/
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