How do you link text fields to QR codes in InDesign?

Hi @Sean22153274qbmh, I've written a script that I think may solve this problem quite well. See instructions in script listing, and let me know what you think.

- Mark

/*
    Update QR-Codes with Styled Text
    for Adobe Indesign

    by m1b
    here: https://community.adobe.com/t5/indesign-discussions/how-do-you-link-text-fields-to-qr-codes-in-indesign/m-p/12582394

    Instructions to set up one updatable QR Code:
    (Do these steps again for each updatable QR-Code.)
        1. Make a text frame:
            • containing your text contents that will be used to update a QR-Code
            • set in a Character Style that the script will use to find updatable QR-Codes
        2. Choose Object > Generate QR Code... and place and scale the QR-Code to suit you
        3. Group the text frame from (1) and the QR Code Graphic from (2).

    Instructions to configure script
        1. character style name below must match the Character Style name in (1)
        2. swatch name supplied below will be applied to the updated QR-Code in (2)
            (comment out that line to use default swatch color)

*/

function main() {

    updateQRCodesWithStyledText(
        /* document to update */
        app.activeDocument,

        /* character style name */
        'Update QRCode Style',

        /* qr code swatch name (optional - comment out next line to use black) */
        'My Swatch Color'
    );

    function updateQRCodesWithStyledText(doc, characterStyleName, qrCodeSwatchName) {
        app.findGrepPreferences = NothingEnum.NOTHING;
        app.changeGrepPreferences = NothingEnum.NOTHING;
        app.findGrepPreferences.appliedCharacterStyle = characterStyleName;
        var texts = doc.findGrep();
        for (var i = 0; i < texts.length; i++) {
            if (!texts[i].hasOwnProperty('contents')) continue;
            var qrCodeGraphic = texts[i].parentTextFrames[0].parent.allGraphics[0];
            if (!qrCodeGraphic.isValid) continue;
            qrCodeGraphic.createPlainTextQRCode(texts[i].contents, qrCodeSwatchName);
        }
    }

} // end main

app.doScript(main, ScriptLanguage.JAVASCRIPT, undefined, UndoModes.ENTIRE_SCRIPT, 'Update QR-Codes');

Does the lot# need to be a QR code? If not, barcodes like 39 and 128 could be generated with a font, and then you could have a dynamic situation where entering data once and populate in many.