Hi Andreas, good question! And you're right in noting that spreadsheets differ quite a lot in practice.

Thankfully, most spreadsheets can be processed by fibooks automatically. If not, you can customize the excel template (see example) or tweak some parameters in the load excel functions (see documentation).

I've created some examples on how to load different spreadsheets and how you can use templates to customize fibooks. If you have any more questions/problems, please create a new issue on GitHub.

example: https://gist.github.com/b8ec511a650ca053e31f289d6899dda8.git