fire a custom pipe after input change

Question

I have a pipe I applied to my form input because I want "visually" separate decimals with ",", but internally with "."

Sometimes I need to set values programmatically and in this case the change is not detected even setting my pipe as impure

pipe

@Pipe({
   name: 'decimalSeparator',
   pure: false
})
export class DecimalPipe implements PipeTransform {

  transform(value: string): string {
     return value ? value.replace('.',',') : '';
   }
}

html template

<form [formGroup]="formGroup">
      <input nxInput value="{{ formGroup.get('pipeInput').value | decimalSeparator }}" formControlName="pipeInput"/>
</form>

typescript

setValue() {
   this.formGroup.get('pipeInput').setValue("100.2"); // Pipe not fired here
}