If you do export all fields that will provide you information on all fields that are there in Jira
Easiest way is to go to Admin -> Custom fields and simply scrape the list from there.
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It shouldn't be a long list, that's why there's no simple "export list" function.
You might want to take a look at the housekeeping and migration prep apps you can get - some of them make the list more manageable in the UI and a couple provide exports.
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