There is no direct option to export a single request from Postman.
You can create and export collections. Here is a link to help with that.
Regarding the single request thing, you can try a workaround. I tried with the RAW body parameters and it worked.
What you can do is,
In your request tab, click on the 3 dots in the top right corner of your request panel/box.
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Select Code. This will open Generate Code Snippents window.
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Copy the cURL code and save it in a text file. Share this with who you want to.
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They can then import the request from the text file.
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