[Bug] <demo中填写级联，填写JSON就会出错>

[MikeJiangInno]

Have you read the Contributing Guidelines on issues?

• I have read the Contributing Guidelines on issues.

Prerequisites

• I'm using the latest version of DripForm、DripFormTheme.
• I have read the console error message carefully (if applicable).

Description

Steps to reproduce

1. 选择”级联选择“
2. 在样式->选项中填写，国家省份的JSON
   国家省份JSON
   3.就会出现”发生错误，请联系管理员！“

Current behavior

Expected behavior

能够显示数据

Your environment

• DripForm version used:
• DripFormTheme used:
• DripFormTheme version used:

Reproducible demo

No response

Self-service

• I'd be willing to fix this bug myself.

[mengshang918]

目前这块转换存在问题，schema中需要数组格式的，这边配置是string格式的。
暂时解决方案：直接json编辑中配置。
后续会优化配置组件