Retrieve nested JSON object by attribute?

Question

I hope this isn't a stupid question. I'm new to working with JSON and am working with a config.js file that contains settings for a PWA. The config.js file contains some custom theming that users can input that looks like this:

"themes": [
    {
      "name": "Normal",
      "enabled": true,
      "colorSets": [
        {
          "type": "main",
          "colors": {
            "PrimaryColor": ...
          }
        },
        ...
      ]
    },
    {
      "name": "Sepia",
      "enabled": true,
      "colorSets": [
        {
          "type": "main",
          "colors": {
            "PrimaryColor": ...
          }
        },
        ...
      ]
    },
    {
      "name": "Dark",
      "enabled": true,
      "colorSets": [
        {
          "type": "main",
          "colors": {
            "PrimaryColor": ...
          }
        },
        ...
      ]
    }
  ],
  "defaultTheme": "Normal",

Say I need the primary color of theme "Normal", "Sepia", or "Dark". Is there a simple way to fetch the color object from that theme? Thanks :)