Return focus to previous input after viewing modal

I am working on an Angular application where I have a form with many inputs to fill out. While filling out the form, the user has an option to open a modal where they can enter notes by using a hotkey. What I am trying to do, is return the focus onto the previously focused input field once the user closes the modal.

As of now, I have what appears to be a working solution, but it seems very tedious and I'm unsure if this is the best way to do something like this.

On every single input field, I have a (focus) that sets a variable prevFocus to the input name. For example:

<input
  (focus)="prevFocus = 'customerName'"
  name="customerName"
  placeholder="Name"
  type="text"
  pInputText
  formControlName="customerName"
/>

This variable is stored, and when the user closes the modal, a function is called:

closed() {
  console.log(this.prevFocus);
  setTimeout(() => {
    this.setFocus(`${this.prevFocus}`);
  });
}

setFocus(name) {
  const ele = this.form.nativeElement[name];
  if (ele) {
    ele.focus();
  }
}

The setTimeout() is used to make sure the input is filled after the component is loaded.

My question, is that I have over 80 input fields, and this seems tedious to do for every single input. But, is this the best way to approach? Has anyone done something similar where the focus will return after doing a different action or temporary losing focus?

HERE is a Stackblitz I created to show what I am looking at. There are a few functions such as for the hotkey shortcut, and I am using the PrimeNG library. The library and other functions don't relate to the specific concern of returning to the previously focused input, but they are included to get the full user experience: Begin filling out form with input in focus → use hotkey (alt + a) to open modal → click esc or click the x to close → input focus returns.

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