ant-design/components/form/demo/form-item-path.tsx

import React from 'react';
import { Button, Form, Input } from 'antd';
import type { FormItemProps } from 'antd';

const MyFormItemContext = React.createContext<(string | number)[]>([]);

interface MyFormItemGroupProps {
  prefix: string | number | (string | number)[];
}

function toArr(str: string | number | (string | number)[]): (string | number)[] {
  return Array.isArray(str) ? str : [str];
}

const MyFormItemGroup: React.FC<React.PropsWithChildren<MyFormItemGroupProps>> = ({
  prefix,
  children,
}) => {
  const prefixPath = React.useContext(MyFormItemContext);
  const concatPath = React.useMemo(() => [...prefixPath, ...toArr(prefix)], [prefixPath, prefix]);

  return <MyFormItemContext.Provider value={concatPath}>{children}</MyFormItemContext.Provider>;
};

const MyFormItem = ({ name, ...props }: FormItemProps) => {
  const prefixPath = React.useContext(MyFormItemContext);
  const concatName = name !== undefined ? [...prefixPath, ...toArr(name)] : undefined;

  return <Form.Item name={concatName} {...props} />;
};

const App: React.FC = () => {
  const onFinish = (value: object) => {
    console.log(value);
  };

  return (
    <Form name="form_item_path" layout="vertical" onFinish={onFinish}>
      <MyFormItemGroup prefix={['user']}>
        <MyFormItemGroup prefix={['name']}>
          <MyFormItem name="firstName" label="First Name">
            <Input />
          </MyFormItem>
          <MyFormItem name="lastName" label="Last Name">
            <Input />
          </MyFormItem>
        </MyFormItemGroup>

        <MyFormItem name="age" label="Age">
          <Input />
        </MyFormItem>
      </MyFormItemGroup>

      <Button type="primary" htmlType="submit">
        Submit
      </Button>
    </Form>
  );
};

export default App;