Support for "v-bind" in <style>

### Description

First raised here: https://discourse.nodered.org/t/db2-dynamic-background-image-to-body/89024/34

`v-bind` is an easy way of being able to dynamically define CSS content in a Vue SFC - [docs](https://vuejs.org/api/sfc-css-features.html#v-bind-in-css)

Having tried it out in a `ui-template` myself, I'm not able to get it to work, and it seems as though the browser/rendered template doesn't even try to parse the `v-bind`.

This will require more investigation to understand the _why_

### Have you provided an initial effort estimate for this issue?

I have provided an initial effort estimate