Relax, he already gave you the solution, he made the changes and create a PR but until it will be merged you can just SSH to your TrueNAS and run this.
create nextcloud.json with this content:
{ "name": "Nextcloud", "plugin_schema": "2", "release": "12.2-RELEASE", "artifact": "https://github.com/EliasGabrielsson/iocage-plugin-nextcloud.git", "official": false, "properties": { "nat": 1, "nat_forwards": "tcp(80:8282)" }, "pkgs": [ "ffmpeg", "nextcloud-php74", "php74-pecl-imagick-im7", "php74-bcmath", "php74-gmp", "php74-pcntl", "nginx", "mysql80-server" ], "packagesite": "http://pkg.FreeBSD.org/${ABI}/latest", "fingerprints": { "iocage-plugins": [ { "function": "sha256", "fingerprint": "b0170035af3acc5f3f3ae1859dc717101b4e6c1d0a794ad554928ca0cbb2f438" } ] }, "revision": "0" }
run this command:
iocage fetch -P nextcloud.json
thanks @moddo