Environment to align text similar to formulas?

Questions
1

In formulas I might want to insert text descriptions:

$
  a = & f(b) \
  & #align(left, box[
      (text descriptions)
    ])
$

Sometimes the text descriptions can get very long and need multiple lines.
Instead of

(hello
world)

I think

(hello
 world)

looks better. I know this can be implemented with hide, but is there a way to do it like in formulas with &?

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