Using the console log output (very basic question)

I had liked to try programming simple tasks in Musescore using the plugins capability.
Unfortunately, I already fail on a "Hello world" test.
Running the example here below, I very briefly see a window but it immediately disappears.
If I add "wait (2000);" before Qt.quit(), the window remains visible, but it is empty.
Also, it remains visible forever while the wait should have only lasted 2000ms.

I probably miss some very basic information about how a Musescore plugin can output messages.

Looking at the provided examples, I found another way using a "rectangle" definition with a text property.
This works fine.

However, it does not tell me what happens with the "console log" instructions.
There are such instructions in all provided examples, so there must be a way to see the log.

Thank you in advance for your support.
Roger

//----------------------------------------------------
import QtQuick 2.0
import MuseScore 3.0

MuseScore {
version: "3.0"
description: qsTr("Test console log")
pluginType: "dialog"
menuPath: "Plugins.Test"

onRun: {
    console.log("Test OK");
    Qt.quit();
    }
}

//----------------------------------------------------