change the text of a MOGRT with ExtendScript in Premiere Pro 2023

Hello,

I'm looking for a way to modify a Mogrt with ExtendScript but I can't find it.

I have a Text in a Mogrt called "SRT Data". I would like to code the fact that it takes the selected mogrt and modifies the text with my variable.

app.enableQE();

var sequence = app.project.activeSequence;
var videoTracks = sequence.videoTracks;

var mogrtClip;
for (var i = 0; i < videoTracks.numTracks; i++) {
    var track = videoTracks[i];
    for (var j = 0; j < track.clips.numItems; j++) {
        var clip = track.clips[j];
        if (clip.isMGT() && clip.isSelected()) {
            mogrtClip = clip;
            break;
        }
    }
}

if (mogrtClip) {
    var mogrtProperties = mogrtClip.getMGTComponent().properties;
    for (var i = 0; i < mogrtProperties.numProperties; i++) {
        var property = mogrtProperties[i];
        if (property.displayName == "SRT Data") {
 
            property.setValue("New Text", true);
        }
    }
}

the problem is that "mogrtProperties" is undefined. I would like to know if I'm doing it wrong, I've already looked at other forums and they did it like this

Thank you for your help!