In SPSS it is possible to create so called "Custom Attributes" for each variable, for example additional comments, calculation logic, etc. Currently (as far as I could see) these are not imported or exported in pyreadstat. Is there a way to also access them and have them available in the metadata container? This is an example SAV File with 4 additionally created custom attributes: [SPSSCustomVarAttributes.zip](https://github.com/Roche/pyreadstat/files/13614448/SPSSCustomVarAttributes.zip) 