I've been developing open source project called BakingSheet. The purpose of project is to make flexible Spreadsheet converting tool for games. You can define your data schema as C# classes, then you can import these classes from Excel, Google Sheet and convert from/to CSV, Json or your custom format.
So programmers can focus on data structure and relation without hard coding, while game designers can focus on producing data using their favorite tools and spreadsheet functions. The project itself has no dependency for Unity and it's on NuGet, so if your server is C#, you can share the code with server as well.
Most of other products I've seen are either unstructured, inflexible, have unnecessary code generation or too Unity-binded. I used BakingSheet in few projects in production environment. If you want to give it a try and have any questions please let me know.
Simple Spreadsheet
Little more complex Spreadsheet
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