渲染时，外部组件如何能获取schema中form表单的值

schema是一个form表单，在antd的modal组件中渲染schema内容，提交按钮是Modal的footer组件，不在schema中，点击提交按钮如何能触发表单提交获取表单的值？

能不能获取到schema渲染后的form表单实例？

No file, test, or entry point is identified. Start by locating how schema forms are rendered and how an antd Modal footer invokes actions, then determine whether the rendered form instance and submission values are exposed. Done means documenting or implementing a clear way for the external submit button to submit the form and receive its values.

Written by the indexing model from the issue text.