[Feature Request]怎么样在表格中获取 对象的对象中的属性如（obj1.obj2.name）

### What problem does this feature solve?
解决了 jpa 获取 one to one 引用对象在 表格中显示的问题

### What does the proposed API look like?
`{
title: "经销商",
key: "franchiser.cusName",
align: "center",
width: 150
}`

No file or test is named in the issue. Start by tracing the table column-rendering entry point and the handling of the `key` value; confirm that a key such as `franchiser.cusName` displays the nested property's value, then add or update coverage for that behavior.

Written by the indexing model from the issue text.