[Feature] Input text around param invocations.

[danielrob]

Currently there's no way to add text to component children.

As an initial step in this direction I'm suggesting to be able to:

<Component>
  add text {param} next to params
</Component>

This can just be a template property on the Invocation model, perhaps in tagged template style: ['add text ', ' next to params', invocationId] or something that suits.