curl --location --request GET '/rest/api/3/fieldconfiguration//fields'
{"isLast":true,"maxResults":50,"startAt":0,"total":2,"values":[{"description":"For example operating system, software platform and/or hardware specifications (include as appropriate for the issue).","id":"environment","isHidden":false,"isRequired":false},{"id":"description","isHidden":false,"isRequired":false}]}