Hi ! you must register an event client side with RegisterNuiCallbackType() and define a name for trigger (with $.post) this event with your UI. (Sorry for my english)

Client side

RegisterNuiCallbackType("myEvent");
on("__cfx_nui:closeUi", (data, cb) => {


})

UI Side (your app.js in HTML folder)

$.post('http://scriptName/myEvent');  // JQUERY REQUIRED
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