Looks like you can deduct long term insurance from a health saving account. But…..
With annual premiums north of say $4000/yr you are only allowed to use ~$780 from your HSA, which is the deductible amount. Something, but nowhere near enough to encourage this method. PIA recordkeeping too.
Or, you can itemize and claim full expense for policy outside of HSA but you will probably bump up against the 7.75% AGI cap.