Blogger labels or categories are set as "noindex, follow" by default. Same is done in wordpress sites because label pages are created for providing good user engagement and not to rank your keywords on SERPS. It is highly recommended that category pages are set to noindex to ensure Google does not penalize you for publishing duplicate content on these pages.
Labels are also blocked by your blogger robots.txt file as shown below:
here disallow:/search means to stop indexing pages that have the string /search in it. Which means search robots will avoid indexing your label pages and search queries.
Hope this helps