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You should be able to install Kivy into your Python installation and then use them within Wing. There is no support specific to Kivy language, but you can get reasonable syntax highlighting for them by setting the file type to YAML or use the Files > File Types > Extra File Types preference to map the .kv extension to YAML.
I believe Kivy is a set of libraries for Python and not a different language. You should be able to install Kivy into your Python installation and then use them within Wing. There is no support specific to Kivy language, but you can get reasonable syntax highlighting for them by setting the file type to YAML or use the Files > File Types > Extra File Types preference to map the .kv extension to YAML.Wing.