Checklist

• I've searched for similar issues.
• I'm using the latest version of HTTPie.

Minimal reproduction code and steps

1. export a collection from Postman with type v 2.0 or v 2.1
2. Try importing same in httpie
3. observing an error (attaching a screenshot)
   

Current result

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Expected result

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Debug output

Please re-run the command with --debug, then copy the entire command & output and paste both below:

$ http --debug <COMPLETE ARGUMENT LIST THAT TRIGGERS THE ERROR>
<COMPLETE OUTPUT>

Additional information, screenshots, or code examples

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