Office JS Dialog - How to get back/keep context with Excel

I'm messing around w/ Office Dialog for Add-Ins in JS. I've got it so far where I can open a dialog, capture input to console, run a function from a button and close the dialog box, but I can't seem to get my function to interact with Excel. It's lost context I beleive, I tried using this and I get no errors, but it doesn't work --> var context = new Excel.RequestContext().

Here is my open function and my main function and the end function.

main.js

export async function helloworld(event) {
    try {
        await Excel.run(async (context) => {
            //Start Func
            console.log("BEFORE OPEN UI");
            openDialog("/yo/dist/dialog.html", 30, 20);
            console.log("AFTER OPEN UI");
            await context.sync()
                .then(function () {
                    console.log("AFTER SYNC UI");
                    var ws = context.workbook.worksheets.getActiveWorksheet();
                    var range = ws.getRange("A1:D5");
                    range.select();
                })
            //End Func
            await context.sync();
        });
    } catch (error) {
        console.error(error);
    }
    console.log("EVENT COMPLETEED HELLOW");
    //event.completed();
}

open.js

function openDialog(RelURLStr, H, W) {
    Office.context.ui.displayDialogAsync(window.location.origin + RelURLStr,
        { height: H, width: W }, dialogCallback);
}

run func //this gets ran, but nothing output to worksheet and no errors.

function dobuttonrun(event) {
    console.log("ENDING");
    var context = new Excel.RequestContext()
    var ws = context.workbook.worksheets.getActiveWorksheet();
    var fakedatarng = ws.getRange("A1");
    fakedatarng.values = "TEST";
    return context.sync();
    event.completed();
}

function getGlobal() {
    return typeof self !== "undefined"
        ? self
        : typeof window !== "undefined"
            ? window
            : typeof global !== "undefined"
                ? global
                : undefined;
}

const g = getGlobal();

// The add-in command functions need to be available in global scope
g.dobuttonrun = dobuttonrun;

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