Any way to have a popup hint with the variation_selector?

[keylogthis]

So I'm trying to enable the hint for popups under a variation_selector. I've tried labelFlags 512 and 2048 but neither did anything. Am I missing something or is it not possible?

Example Snippet

    { "$": "variation_selector",
      "default":  { "label": ",", "popup": { "relevant":
        [
            { "label": "voice" },
            { "label": "emoji" },
            { "label": "one_handed" }
        ] } },
      "email":    { "label": "@", "type": "function", "popup": { "relevant":
        [
            { "label": "voice" },
            { "label": "emoji" },
            { "label": "one_handed" }
        ] } },
      "uri":      { "label": "/", "type": "function", "popup": { "relevant":
        [
            { "label": "voice" },
            { "label": "emoji" },
            { "label": "one_handed" }
        ] } }
    }

[fallsdevil]

[fallsdevil]

I don't know if it can be useful for you, but at the end of this link there is a script for the keyboard's number line to be replaced by symbols when shit is activated, you can try something similar...