There are many questions on parsing timestamps. In this case, you can just get the parts as two digit pairs then use that to call the Date constructor.

Since the timestamp has a trailing "Z", likely it should be parsed as UTC so:

let ts = '20220722T141444Z'
let [C,Y,M,D,H,m,s] = ts.match(/\d\d/g) || [];
let date = new Date(Date.UTC(C+Y, M-1, D, H, m, s));

console.log(date.toISOString());

There are many other ways to approach the problem, such as modifying the values to create a supported format such as `2022-07-22T14:14:44Z', however it's more efficient to give the parts directly to the Date constructor than to build a string then have the built–in parser parse it.

there is a way in javascript but i think it wont work with this format

change the format like this and try

new Date('20220722T141444Z')
Invalid Date
new Date('20220722')
Invalid Date
new Date('2022 07 22')
Fri Jul 22 2022 00:00:00 GMT+0530 (India Standard Time)

Because new Date(string) returns an Invalid Date I'd do it like that and use String.prototype.slice():

function date(a) {
    return `${a.slice(6, 8)}.${a.slice(4, 6)}.${a.slice(0, 4)}`;
}

console.log(date("20220722T141444Z"));
// output: 22.07.2022