Angular pipe, custom decimal numbers

having

let myNumber = Math.PI;
let myPrecision = 4;

How can I display myNumber using myPrecision?

<label> {{ myNumber | ???myPrecision }} </label>

One not really elegant, but solution, could be

<div> {{ myNumber | number: '1.' + myPrecision + '-' + myPrecision + }} </div>

PS.
After the Joosep's suggestion, I made a custom pipe, like this

import { Pipe, PipeTransform } from '@angular/core';

@Pipe({ name: 'precision' })
export class PrecisionPipe implements PipeTransform {
  transform(value: number, precision: number): string {
    return value.toFixed(precision);
  }
}

so now I can use

<div> {{ myNumber | precision: myPrecision }} </div>