MarsSeed [1] filed a deletion request for curl-http3-ngtcp2 [2]: Long broken. Abandoned since Jan 2024. 0 pkgstats.
Arch/extra/curl already supports http3. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/curl-http3-ngtcp2/