Input file csv for custom files in attrs

How to carry out the import process from a csv file of custom fields, I already have the fields added, the forms accept them well, but I have problems with how to configure the csv and the bind xml, what should be written in the csv and what the xml, I have added, for example, to the leads model two fields, one called identification and another rut


Take a look on this page CSV DataSource :: Axelor Documentation for CSV Import and the following example for customs json fields