The following steps will help you import your notes from Standard notes easily.
Preferencesicon on bottom left corner to open preferences.
Data backupssection and choose backup type
Backupsfrom the Sidebar & select “Data backup” to download backup .zip file.
Standard Notesfrom list of apps.
.zipfile, go to Notesnook app > Settings > Notesnook Importer and click on “Import from ZIP file” & select the .zip you downloaded earlier.