VersionIssueCounts

{
    "customFieldUsage": [
        {
            "customFieldId": 0,
            "fieldName": "string",
            "issueCountWithVersionInCustomField": 0
        }
    ],
    "issueCountWithCustomFieldsShowingVersion": 0,
    "issuesAffectedCount": 0,
    "issuesFixedCount": 0,
    "self": "http://example.com"
}