difficulty in finding letters and words in a string

I have text and want to find the number of letters like ‘a’, ‘i’, and also the word ‘it’. I’ve been able to find the number of letters ‘a’ and ‘i’, but for the word ‘that’ I can’t find

let text = "Lorem ipsum dolor sit amet consectetur adipisicing elit. Culpa, perspiciatis? Reiciendis, facere nobis libero officiis labore sit, deserunt maiores perferendis tempore quas neque odit. Quasi culpa totam aspernatur deserunt nobis."
let words = ["a", "i", "it"]

result_a = [];
result_i = [];
result_it = [];

for (let i = 0; i < words.length; i++) {
    for (let j = 0; j < text.length; j++) {
        if (words[i] == text[j] && words[i] == words[0]) {
            result_a.push(text[j]);
        } else if (words[i] == text[j] && words[i] == words[1]) {
            result_i.push(text[j])
        } else if (words[i] == text[j] && words[i] == words[2]) {
            result_it.push(text[j])
        }
    }
}

console.log(result_a.length) //13
console.log(result_i.length) //24
console.log(result_it.length) //0

The output I expect is the number of each word searched for, for example the number of ‘a’ in the text variable is 13

my code is too long, is there a more concise way? and how to find ‘it’

>Solution :

let text = "Lorem ipsum dolor sit amet consectetur adipisicing elit. Culpa, perspiciatis? Reiciendis, facere nobis libero officiis labore sit, deserunt maiores perferendis tempore quas neque odit. Quasi culpa totam aspernatur deserunt nobis."
let words = ["a", "i", "it"]
var wordToCount = {};

words.forEach( word => {
  let searchText = new RegExp(word, 'g')
  var matchCount = (text.match(searchText) || []).length;
  wordToCount[word] = matchCount;
});

for (const [key, value] of Object.entries(wordToCount)) {
  console.log(key, value);
}