Read Var from PLC and push to the list

Hello, I am trying to push DATA.DATA[1...5] to the list named myList. I am using readDirect in the loop at my function readArray which return a list.

At main module.run I've executed readArray(5). First console.log returns me the correct array, but the second with length returns me 0. Additional I have noticed, that when I try: for (let i in readArray(5)) - it looks like this array doesn't exist anymore. I definitely doing something wrong, but I don't know what exactly.

(function() {

    /**
     * replace module name with a custom name for the local-script.
     *
     * All local-script should be attached to the "custom.ls" package.
     * If more than one script is required for an application, a common root package
     * should be created (e.g. "custom.ls.customerName.*").
     */

    var MODULE_NAME = "readValue",
        ENABLE_LOGGING = false,
        RECORD_LOG = false,
        logger = shmi.requires("visuals.tools.logging").createLogger(MODULE_NAME, ENABLE_LOGGING, RECORD_LOG),
        fLog = logger.fLog,
        log = logger.log,
        module = shmi.pkg(MODULE_NAME);

    // MODULE CODE - START

    /* private functions */
    function readArray(count){
        let mylist = [];
        
        // Get a reference to the ItemManager
        const im = shmi.requires("visuals.session.ItemManager");

        for (let step = 1; step < count + 1; step++) {
            let itemName = `DATA.DATA[${step}]`;

            im.readDirect([itemName], function(err, result) {
                let a = result[itemName];
                if (!err) {
                    mylist.push(a);
                } else {
                    console.log("readDirect failed: " + err, "ReadDirect Error");
                }
            });
        }
        return mylist
    }
    

    /**
     * Implements local-script run function.
     *
     * This function will be called each time a local-script will be enabled.
     *
     * @param {LocalScript} self instance reference of local-script control
     */
    module.run = function(self) {
        let a = readArray(5);

        console.log(a);
        console.log(a.length);
        
        
        // var container = shmi.ctrl(".mybox"); 

        // for (var i in a) {
        //     if (container && container.isInitialized()) {
        //         container.addControl([{
        //             ui: "container",
        //             config: {
        //                 name: "generatedContainer"
        //             },
        //             children: [{
        //                 ui: "button",
        //                 config: {
        //                     label: i,
        //                     action: [{
        //                         name: "notify",
        //                         params: [
        //                             "Message #1",
        //                             "Title #1"
        //                         ]
        //                     }]
        //                 }
        //             }]
        //         }], function(err, controls) {
        //             if (err) {
        //                 console.error("Error creating controls:", )
        //             } else {
        //                 console.log("Controls initialized:", controls);
        //                 g = controls
        //                 /*
        //                     updateShape(250, 300, controls[0].controls[0])
        //                     updateShape(50, 50, controls[0].controls[1])
        //                     controls[0].controls[1].element.style.width 
        //                         */
        //             }
        //         });
        //     }
        // }

        /* called when this local-script is disabled */
        self.onDisable = function() {
            self.run = false; /* from original .onDisable function of LocalScript control */
        };
    };


    // MODULE CODE - END

    fLog("module loaded");
})();