When using a __DATA__ segment, you can't use an __END__ segment. Delete that __END__ line that you added. This is the reason that I embedded the output as a Perldoc instead of attaching the output after an __END__ segment.
Also, add "use strict;" to the code like I did. This will help you as you experiment with the code.
Update: this error: "JSON error at line 110, byte 2639/2647: Unexpected character '_' parsing initial state: expecting whitespace: 'n', '\r', '\t', ' ' at ./1.marshall.pl line 8, <DATA> line 1." Is complaining about the first underscore in the __END__ line that you added. The result is invalid JSON syntax. Error messages are often hard to figure out.
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