Generate controls inside formGroup ordered by index of foreach

I am trying to generate checkboxes for each day in a week. I created a string[] for the days and I loop over it to push new form controls to a form group. The looping goes in order of the array's index but the formGroup stores it by alphabetical order.

Is there any way to manipulate the order of the formGroup? I would like the form controls inside the formGroup to keep the array's order instead of being ordered alphabetically.

Example:

daysInWeek = [
    'monday',
    'tuesday',
    'wednesday',
    'thursday',
    'friday',
    'saturday',
    'sunday'
];

this.daysInWeek.forEach((day, index) => {
                console.log('day: ' + day + ' index: ' + index)
                this.frequentie.addControl(day, new FormControl(false));
            });
            console.log(this.frequentie.controls);

OUTPUT

Above screenshot shows the controls inside my formGroup being ordered alphabetically.