Access interpolated variable possible?

[MartyMcFlyInTheSky]

So I want to access a variable dynamically, meaning the variable name is given by the arguments to a widget.

(defwidget reveal-tray [icon name onclick]
    (box :orientation 'h'
        (revealer
            :transition 'slideleft'
            :reveal { get_env('reveal_${name}') }
            (label :text name))
        (eventbox
            :onhover `${EWW_CMD} update reveal_${name}=true && notify-send 'notif = ${ get_env("reveal_${name}") }'`
            :onhoverlost `${EWW_CMD} update reveal_${name}=false`
            :class 'eventbox'
            (button
                :onclick onclick
                :class 'icon'
                icon))
    )
)

In this excerpt the reveal_X variable is dynamically accessed according to the name parameter to the widget. Of course the variable needs to be instantiated first, so what I have is

(defvar reveal_mywifi false)
(defvar reveal_myvpn false)

lying around in global scope. However, it seems that I can not interpolate get_env(reveal_${name}), also get_env generally doesn't seem to work for me (how to use it?). But that begs the question if I'm approaching this the wrong way. The idea I had was to make a generic revealer that has an icon and will reveal some text if the icon is hovered ovedr, then infuse this revealer with custom variables. Is this possible in some way?