Define as Read Only input (Angular)

ReactiveFormReadOnlyInput.ts

//... ReadOnly // new FormControl({value: null, disabled: true}, Validators.required),
this.registerForm = this.formBuilder.group({
      first_name: ['', Validators.required],
      last_name: ['', Validators.required],
      email: new FormControl({value: null, disabled: true}, Validators.required),
      password: ['', Validators.compose([Validators.required, Validators.email])],
      confirm_password: ['', Validators.required],
});
//... Get Values
this.registerForm.getRawValue();