I am sure this same question was answered earlier. You can use what is known as 'substantial authority stand' and file as 1256 taking a departure from broker in the event he did 1099 b on these. Document in 8725 as a note. A cpa should be that substantial authority and not you as an individual. In the event you get audited he undertakes the responsibility. If filing on your own wait for brokers decision and you are out of luck without a cpa (assuming audit). Whether the cpa will agree to do this or not is the next issue. Some will agree and some will disagree. Next year trade these in a tax deferred account. Avoid headaches.
And don't quote this post fro. ET in the footnote as a reference claiming substantial authority as I am not a qualified individual to advise you.
https://greentradertax.com/trader-tax-center/tax-treatment/section-1256-contracts/ So, as long as UVXY and TLT are not considered equities, options on them would be considered Section 1256 contracts.
Did you check the prospectus? You will get a K-1 as this is a fund taxed as a partnership. Part of the K-1 should reflect the underlying "VIX Short-Term Futures" as section 1256.