[Solved] show variable value on favorite page

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hi guys

how can i add a variable to the favorite pages?
i want to show the value of the variable, because i have a buttonsdevice to control the value. (need it for activate deactivate rules)
i can just add “devices” to the favorite page
thanks

dk00000

{
      "id": "control-variable",
      "name": "test var",
      "class": "VariablesDevice",
      "variables": [
        {
          "name": "myVar",
          "expression": "$value",
          "type": "number"
        }
      ]
    },

Thanks a lot!!