How do I specify a JSON field that has a union type?

[Tebro]

Say I want a field in a struct that takes a variable type, either an interface or even any. Is this possible to do? Or do I need to have them as separate fields?

Example

type Input struct {
	Task struct {
		Type string `json:"type"`
		Data any `json:"data"`
	} `json:"task"`
}

{
	"task": {
		"type": "one",
		"data: {
			"value": 123
		}
	}
}

{
	"task": {
		"type": "two",
		"data: {
			"values": [1,2,3]
		}
	}
}