Hi Jose,
Greetings from Syncfusion.
Currently, XlsIO does not have support for Slicers. We
already have the Feature task for this but do not have any immediate plans to
implement this feature in near future. You can track the status of the feature
report through the following feedback link.
Feature Feedback - https://www.syncfusion.com/feedback/13312/slicer-in-excel
Regards,
Ramya.