Set Defaults for AREOI blocks in my theme’s theme.json

Not sure if I am doing this correctly, but I wanted to set the defaults for a few of this plugin’s blocks in my theme.json.

I know I can do that for core blocks like this:

{
  "version": 2,
  "$schema": "https://schemas.wp.org/trunk/theme.json",
  "settings": {
    "appearanceTools": true,
    "border": {
      ...
    },
    "color": {
      ...
    },
    "layout": {
      "contentSize": "1600px",
      "wideSize": "100%"
    },
    "spacing": {
      ...
    },
    "typography": {
      ...
    },
    "blocks": {
      "core/heading": {
        "color": {
          "text": true,
          "background": false,
          "link": false,
          "palette": [
            {
              "color": "#ffffff",
              "slug": "white",
              "name": "White"
            }, 
            {
              "color": "#4f99bb",
              "slug": "blue",
              "name": "#4f99bb - Blue"
            }
          ]
        },
        "typography": {
					"fontFamily": "var(--wp--preset--font-family--MINE)"
				}
      }
    }
  },

However, when I try to add in the areoi/container block like this (under “blocks”)

      "areoi/container": {
        "attributes": {
          "container": {
            "type": "string",
            "default": "container-xl"
          }
        }
      }

It doesn’t work.

Note: When I edit the default value in the blocks/container/block.json, it does work.

Am I going about this the wrong way? Is there a PHP function instead to override the default value for this or any other block in this plugin?

Thanks in advance!