Is <include> element of firewalld services a Fedora-only thing?

In firewalld documentation there is no mention of include, but when I look at the actual service files on a vanilla installation of F36 I can see many services with this element. Is it specific to Fedora or is it an omission in firewalld documentation?

It is not specific to Fedora. It is covered in the firewalld documentation here.

Here is an example straight from firewalld github:

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