How to Define Entity Resolution Across Multiple Input Tables in Zingg AI?

Hello All, I ended up here after looking at : https://www.zingg.ai/documentation-article/identifying-duplicates-in-snowflake-with-zingg So the entity resolution works on just one input table? What if we had multiple different input tables? How would the entity resolution needs to be defined? Example: We have Customer table and then we have Reviews table, A purchase transaction table. What if we want to unfiy across all these three domains?