You should create a pipe for your needs.

Here I can share my pipe, which groups given number by 3 digits

Example: 123456789 -> 123 456 789

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

@Pipe({
  name: 'formatNumber',
})
export class FormatNumberPipe implements PipeTransform {
  transform(value: number | string, ...args: unknown[]): string {
    let v = String(value);
    v = v.replace(/[^\d.]/g, '');
    v = v.replace(/\./g, ',');
    let parts = v.split(',');
    let result = parts[0].replace(/(?!^)(?=(?:\d{3})+$)/g, ' ');

    if (parts[1]) {
      const glueSymbol = args[0] ? args[0] : ',';
      result += glueSymbol + parts[1];
    }

    return result;
  }
}