Creating a series introduction

I have created a series taxonomy for series of blog posts I’m writing. I would like to write an introduction for the series that will be included at the top of each post in the series and possibly on the taxonomy list page. Based on my research, it seems like the cleanest way to do that is to create a data file with an “intro” field containing the introduction and then use a shortcode to include it in on my posts/pages. The thing is, the data section seems more oriented towards lists of data items. Is there a better way to do this? Am I missing something?

Your way seems to be the current cleanest solution.

/data is just a big dictionary. So a /data/series.toml => name => intro => Some text … would work fine.

Thanks, @bep!
Your approach is even simpler than the one I was going to take.