Provide a way to transform data

[darenasc]

Is your feature request related to a problem? Please describe.
It would be ideal to provide an interface to transform data at column level. For example adding representation codes so that when a code appears in the table it can be visualized with its interpretation.

Describe the solution you'd like
Include a dict where to store a dictionary alike for code transformations at the code level, so that reports can be visualized with these clear data.

Describe alternatives you've considered
Adding a user-input in the streamlit app or by passing a dictionary as a config file.