German users can download the WISO CSV file on the reports page under "Download" and select "WISO Steuer CSV".
This file can simply be uploaded to WISO, which then automatically fills in the fields "Private Veräußerungsgeschäfte (§23)" and "Einkünfte nach Leistungen (§22 No.3)".
WISO does NOT support the direct import of capital gains - Kapitalerträge (§20). These must be entered manually.
Please read the German version of this guide for more information.