This might be similar feature to this: https://roadmap.thestorygraph.com/de/requests-ideas/posts/tag-groups

I feel I've seen this request before, but I couldn't find it.

I would like to group several tags into one data point in my custom chart, e.g. having only one bar in my bar chart representing the tags "1860", "1870", "1880" and "1890" as "1800s".
The book count should be summed up, but books with several of those tags should only be counted once.