Annuity vs. Structured Settlement

Trying to avoid litigation and/or state delays of a structured settlement. I am eligible for tax free payments for life.

The insurance carrier has agreed to amount and wondering if this can be done with a specialized annuity or does the "tax free" payout requirements of the state force it to be a Structured Settlement?

Seems like the Structured Settlement is really just the language and not the vehicle (i.e. annuity) itself?

Please explain if you would