Extending the Composer's request history list is not supported.
You can, however, drag/drop sessions to the Composer from either the Web Sessions list or a Session Clipboard (extension) or any extension you like.
Posted on:03 Nov 2020 11:07
Apart from what Eric could suggest here, I want to mention that a similar topic and different solutions for outputting the requests are offered here (still, this is not happening within the Composer UI).
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