Storage data is not shown in dialog buttons

When trying to load a storage value as label for a button within the new dialogs it is not shown. Below is an example I’ve tried.

{
  "type": "minecraft:multi_action",
  "can_close_with_escape": true,
  "external_title": {
    "translate": "menu.nice_mobs.mob_spawning.title.external",
    "fallback": "Mob Spawning"
  },
  "title": {
    "translate": "menu.nice_mobs.mob_spawning.title",
    "fallback": "Nice Mobs: Mob Spawning"
  },
  "actions": [
    {
      "label": {
        "nbt": "nice_mobs.spawning.bloomer",
        "storage": "eden:gamerule"
      }
    }
  ]
}