Setting Mermaid.js layout

[indoyoon]

Hi, I would like to use "ELK" layout instead of default "dagre". So I changed the options.layout to "elk" but it is not working.
I can confirm other options like maxTextSize is working well.

themeConfig: {
    mermaid: {
      options: {
        layout: "elk",
      },
    },
}