So, what I propose here is doable (I think), but we should think hard and long before we decide if and how.

I was reminded of this in

https://discourse.gohugo.io/t/catch-exception-for-transform-unmarshal-csv/37965/10

We currently have a special case for resources.GetRemote which, when it fails, returns a "Resource proxy" with .Err set.

My idea would be to do something like this:

{{ $g := "hello = \"Hello Hugo\"" | transform.Unmarshal | try }}
{{ with $g.Err }}
  // print error (or something)
{{ else }}
  {{ $resource := $g.Value }}
{{ end }}