i'm curious if its possible or if anyone has created something like this -

{{#customHelper}}
    {{attr key="id" value="unique_val"}}
    {{attr key="class" value="not_unique"}}
{{/customHelper}}

where the customHelper either has some knowledge of the tag structure within it

OR

the attr helper is able to set values such that customHelper is aware of them.

this could be a very useful tool for composing content.