在插入 DocumentDB 的 azure Logic 应用程序工作流步骤中,我如何 "toString" 一个数字

In an azure Logic app workflow step that inserts into DocumentDB, how can I "toString" a number

在我的逻辑应用程序的 DocumentDb 步骤中触发 "create document" 时,我收到一条错误消息,指出 id 是一个数字。如何在插入步骤中 toString id 数字?

  "actions": {
            "Create_or_update_document": {
                "inputs": {
                    "body": {
                        "body": "@triggerBody()",
                        "createdAt": "@triggerBody()?['created_at']",
                        "description": "@triggerBody()?['description_text']",
                        "dueBy": "@triggerBody()?['due_by']",
                        "priority": "@triggerBody()?['priority']",
                        "requesterId": "@triggerBody()?['requester_id']",
                        "source": "@triggerBody()?['source']",
                        "status": "@triggerBody()?['status']",
                        "id": "@triggerBody()?['id']",
                        "type": "@triggerBody()?['type']",
                        "updatedAt": "@triggerBody()?['updated_at']"
                    }

摘自here(在Conversion functions下查看):

"@string(triggerBody()?['id'])"