如何在同一表单内，实现子表单向子表单传值，且需考虑到表单导入的功能。

export function onChange({ value, extra }){
  const { formGroupId, from, changes, fieldId } = extra || {};
  if (from === 'setItemValue') return;

  const tableField = this.$('tableField_lgxlpjuh');
  let mum = []
  let a = this.$('tableField_lgxlpjuh').getValue()
  if (a.length > 0) {
    for (let l = 0; l < a.length; l++) {
      if (a[l].numberField_lgxlpjum) {
        for (let k = 0; k < a[l].numberField_lgxlpjum; k++) {
          let s = {
            textField_lgxlpjut: a[l].textField_lgxlpjuk,
            selectField_lgxlpjuu: a[l].selectField_lgxlpjur,
            numberField_lgxlpjuy: a[l].numberField_lgxlpjux
          }
          mum.push(s)
        }
      }
    }
    this.$('tableField_lgxlpjus').setValue(mum)
  }
  
  

}