azure-cli: az devops security group membership list - Returns dictionary instead of JSON array

When running following command

az devops security group membership list --id < vssgp ID or descriptor > \
                                        --detect false \
                                        --org < org. URL>

result is returned like

{
  "aad.YjU...": {
    "descriptor": "aad.YjU...",
    "directoryAlias": "...",
    "displayName": "...",
    "domain": "...",
    "legacyDescriptor": null,
    "mailAddress": "...",
    "metaType": "member",
    "origin": "aad",
    "originId": "...",
    "principalName": "...",
    "subjectKind": "user",
    "url": "..."
  },
  "aad.ZWM...": {
    "descriptor": "aad.ZWM...",
    ...
  }
}

Am I wrongly expecting result to be JSON array? Thanks.

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• ID: 3724db0b-ba6d-0ea6-be45-656a44d6b4dd
• Version Independent ID: 6fe9ab83-4f17-8021-ff21-a1196f510c6b
• Content: az devops security group membership
• Content Source: latest/docs-ref-autogen/devops/security/group/membership.yml
• GitHub Login: @rloutlaw
• Microsoft Alias: routlaw