Not exactly webdev, but I've built a HTML/CSS template that my team drops into reporting dashboards we create.
Because I thought HTML was very eas...
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A shiny app could be explored, though it may not be the best way and you would need to know R. A simple proof of concept could be built using flexdashboard, which is based on rmarkdown. Perhaps combine this with something like tooltip.io/
This is interesting...
It sounds like something a headless CMS and a markdown file generator would be suited for.