Adding a Label-specific Site Feed couldn't be easier.
The Label-feed URL looks like this:
* Labelnames are case-sensitive, too!
* Make sure you include the hyphen (-), too!
The above example is NOT a typo!
*Note: You have to substitute the correct blog name in the above URL !
One other thing you have to watch-out for is whether, or not, the actual blog label is written with an Uppercase, or lowercase initial letter. In other words, if the blog label starts with a Capital, then your Feed URL has to include that. eg: Label, or label
Then, you add the Site-Feed URL to a Blogger Feed gadget, from your Layouts screen, and the Feed will look like this one I did for the Roberto's Report label, Language:
You can do this for any label appearing on any blog - as long as the owner of the blog has enabled the basic Site Feeds for that blog's posts, and that label is apparent.
For more info: < HERE >
See also: Feed URLs - What is mine?
and: Comments-only Site Feed
and: Roberto's Report Newsfeeds