Should Git Tag trailer formatting work?

Hello. 👋

With the recent release of Git 2.46.0, the ability to add trailers to tags was added which is great! However, when attempting to list and format trailer information, I don't see the trailer information display using the following Bash code:

``` 
git tag --list \
        --color \
        --format="%(color:yellow)%(refname:short)%(color:reset)|%(taggerdate:short)|%(color:blue)%(color:bold)%(taggername)%(color:reset)|%(subject)|%(trailers:key=Insertions)" \
        | column -s"|" -t
```

Notice that I'm using the same syntax (`%(trailers:key=Insertions)`) as used in the git for-each-ref (https://git-scm.com/docs/git-for-each-ref#Documentation/git-for-each-ref.txt-rawsize) documentation. If it helps, I also create my Git tag using `git tag` and formatting my message as follows:

``` Version 0.0.0

An example.

Insertions: 10
```

Shouldn't the formatting of my git tags pick up the "Insertions" trailer key and print it? Is this a bug or am I doing something wrong?

Thanks!