Dynamic tags appear to not update in JS

I've been updating CSS based on dynamic tags, but they only appear to interpolate on the inkle side of things and not in the JavaScript.

For example:

```
~ temp character = "Kirby"
# LABEL: { character }
```

```
VAR character = "Kirby"
# LABEL: { character }
```

In both cases, these populate in Inky/in the gameplay text correctly, but when printing them in the JavaScript, show `{ character }` rather than `Kirby`.