Unable to edit the Type Tool text using ExtendScript

Hi All,

Any idea how to edit the text of "Type Tool" using ExtendScript?

I tried to modify the text using below script but it is making the clip empty(removing the existing text).

for(var a = 0; a < app.project.sequences[0].videoTracks.length; a++)
{
    var videoTracks = app.project.sequences[0].videoTracks[a];
    for(var b=0; b< app.project.sequences[0].videoTracks[a].clips.length; b++)
    {
        var clip = app.project.sequences[0].videoTracks[a].clips[b];
        $.writeln(clip.name);
        for(var c=0; c < app.project.sequences[0].videoTracks[a].clips[b].components.length; c++)
        {
            var component = app.project.sequences[0].videoTracks[a].clips[b].components[c];
            for(var d=0; d < app.project.sequences[0].videoTracks[a].clips[b].components[c].properties.length; d++)
            {
                var prop = app.project.sequences[0].videoTracks[a].clips[b].components[c].properties[d];

                //$.writeln(prop.displayName + " = " + prop.getValue());
                
                if(clip.name == 'Graphic')
                {
                    $.writeln(prop.displayName);
                }
                if(prop.displayName == 'Source Text')
                {
                    $.writeln(prop.displayName);
                }
                
            }
        }
    }
}