I do not undestand. __DATA__ is a filehandle. There is no method to add a filehandle's content to a hash. In your example, though, you are using
while (<DATA>) {

[download]
which seems like iterating over the filehandle line by line. What exactly do you need? Why is adding the pairs one by one or creating a temporary hash not an option?
لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re^3: pushing multiple key-value pairs into an existing hash by choroba
in thread pushing multiple key-value pairs into an existing hash by lomSpace

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