That is the wrong format. That is presumably the format for the configuration of some underlying JS library. In TiddlyWiki you would only use the contents in your tiddler. And you would do it in JSON format. So the body of configtimeline would presumably look like this:
Notably, there’s no mention of height or width in there.
And looking at the developer’s console, I can see that the generated code is full of style attributes with height and width values, so it may be quite difficult to override them. But I’ve never used the plugin, so I’m not really sure.