A while back I created the Tabular Model Documenter Power BI model that can connect to your SSAS Tabular or Power BI model and display metadata about the model to help you see relationships, calculations, source queries, and more. I had been meaning to turn it into a parameterized template since templates became available and just finally got around to it.
You can now download the PBIT file here. Note: This works for SSAS 2016/compatibility level 1200, but may need some adjustments for Azure AS and SSAS 2017.
When you open it, you’ll need to fill in the instance and database name, then allow some native queries to run. Then you will have your tabular model documented for you without a lot of manual effort.
For more info on how to use the Tabular Model Documenter, see the original post.