Settings for mathjax3-extension?

[ariel-co]

I'm trying to bring over settings from MathJax 2.7 on Jupyter classic, but there doesn't seem to be a file inside .jupyter/lab/user-settings/@jupyterlab. For now I tried putting { chtml: { displayAlign: "left", scale: 2 } } in mathjax3-extension\plugin.jupyterlab-settings as a wild guess, but apparently the extension needs to have a schema defined with properties.