IIRC, the expression inside the angle brackets has to be either a package filehandle (e.g. <FH>) or a simple scalar as you have used in your working code. To use a filehandle held in a data structure you can use readline, I think, so this should work.

...
    while ( my $line = readline $result->{fh} ) {
...
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I hope I've got that right and this useful to you.

Cheers,

JohnGG