Extensions Must be installed unpacked under %{_libdir}/libreoffice/share/extensions. These are termed bundled extensions. Extensions should not be installed as shared extensions i.e. via unopkg --shared

An extension should normally just be able to Require: an appropriate LibreOffice component e.g. libreoffice-core, without a specific n-v-r as extensions use the stable UNO abi which rarely changes, and then only to add extra apis. So unless you require a specific feature of a LibreOffice release there is no need to require a specific n-v-r and force a rebuild on every n-v-r of libreoffice.

extensions Must be named libreoffice-FOO.

extensions are similar to e.g. xorg video drivers in that there exist proprietary or binary only extensions, but of course normal Fedora rules apply to what extensions can be packaged, i.e. see normal packaging licensing etc. rules. The license Must be acceptable, and the package Must be built from source.

extensions can be written in any language that has an uno binding, e.g. C++, python, java or StarBasic. Consider the additional packaging guidelines of the language that the extension is written in if such guidelines exists.

Many extensions are actually architecture independent, but cannot be noarch packages due to libreoffice limitations. Such packages will generate empty debuginfo sub-packages. If this is the case, add '%global debug_package %{nil}' to the package.