Can you use javascript embedded with visual events?

Like using a variable set up using visual events in javascript?

RuntimeObject or RuntimeScene:
http://wiki.compilgames.net/doku.php/gdevelop5/events/js-code

Can you get variables that way?

Code examples
Read and change the value of a variable:

var myVar = runtimeScene.getVariables().get(“MyVar”);
var myVar2 = runtimeScene.getVariables().get(“MyVar2”);

var currentValue = myVar.getAsNumber();
myVar.setNumber(currentValue+1);

myVar2.setString(“Hello, world”);

Do you need this?

Yes. One more thing, are those scene variables? Just checking.

Yes. According to the link in the wiki, which I indicated above, all this is described.