在插件中如何配置数组对象？使用 json_schema? type: objects ？

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在插件中如何配置数组对象。我尝试了json_schema，但是对象属性配置无法使用 category 这类选择器，只能输入文本。而 type: objects 则根本无法在插件配置中工作。

json_schema 的配置

  quectel_online_customer_category_customers:
    default: "[]"
    client: true
    json_schema: QuectelOnlineCustomer::SiteSettings::CategoryCustomersJsonSchema

plugins/quectel-online-customer/lib/quectel_online_customer/site_settings/category_customers_json_schema.rb

# frozen_string_literal: true

module QuectelOnlineCustomer
  module SiteSettings
    class CategoryCustomersJsonSchema
      def self.schema
        @schema ||= begin
          {
            type: "array",
            uniqueItems: true,
            default: [],
            items: {
              type: "object",
              title: "类别客服配置",
              additionalProperties: false, # 禁止提交未定义字段
              required: %w[category customers], # 两个字段必填
              properties: {
                category: {
                  type: "category",
                  description: "绑定的论坛分类",
                label: "分类"
              },
                customers: {
                  type: "usernames", # 多选用户，替代单用户名username
                  description: "分配至该分类的客服账号，支持多选",
                  label: "客服用户",
                }
              }
            }
          }
        end
      end
    end
  end
end