'I am trying to merge two properties along with validation pls help me

   concernForm = this.formBuilder.group({
  voucherId: [null, [Validators.required,Validators.pattern(validationProps.nonwhiteSpacePattern)]],
  customerId: [null, [Validators.required]],
  description: [null, Validators.required],
  supportingDocument: [null, Validators.required],
  voucherCode: [null, [Validators.required]]
})      

I am trying to merge voucherId & VoucherCode but it is showing error i am passing this object to api

if i do this it is not working

Voucher = voucherId: [null, [Validators.required,Validators.pattern(validationProps.nonwhiteSpacePattern)]] + voucherCode: [null, [Validators.required]],



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