The createTable1 function requires a simple specification of what variables to include in the table. The default specifications included in the package can be reviewed by calling the getDefaultTable1Specifications function. The specification reference analysis IDs and covariate IDs, and in the default specification these IDs refer to those in the default covariate settings. It is possible to create custom table 1 specifications and use those instead.
It appears the process to create custom table 1 specifications is not described.
According to Feature Extraction Vignette
It appears the process to create custom table 1 specifications is not described.