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How I can add intersection observer's callback with window.requestIdleCallback()?

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I have an intersection observer for one animation, but i want to use window.requestIdleCallback()

Where I should add the code window.requestIdleCallback(callback_1)?

my script:

if (document.querySelector('#weddings')) { 

let observer_1;
let Element_1;
let prevRatio = 0.0;
let options = {
    root: null,
    rootMargin: "0px",
    threshold: buildThresholdList()

// Set things up
        Element_1 = document.querySelector("#img-1");


function initObserver() {
    observer_1 = new IntersectionObserver(callback_1, options);


function buildThresholdList() {...}


var gallerySroll_1 = anime({...});


function callback_1 (entries, observer_1) {
  entries.forEach((entry) => {
    if(entry.boundingClientRect.top <= 0 && entry.intersectionRatio != prevRatio){
                gallerySroll_1.seek(gallerySroll_1.duration * (entry.intersectionRatio));
    }else{ gallerySroll_1.seek(1000); }
    prevRatio = entry.intersectionRatio;

if I add the code at the start after the if before anything i got the error:

TypeError: entries.forEach is not a function
    callback_1 https://alessiopaolettidesign.it/ph/js/main.js:343


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