How to pass variable value to a column in table?

I am using csv data source and Loki data source. I am joining the data from Loki and csv at UI level.
I enabled below feature to enable variable passing in ‘filter by value’ transformation.
[feature_toggles]
enable = transformationVariableSupport
transformationVariableSupport = true.

After setting this, I am able to pass variable on csv column. But its affecting filter by data functiuonality. when I pass harcoded value instead of variable in filter, its throwing error saying ‘re.replace’ is not function