I suspect that this response might not be very helpful; however, a good practice in role creation is to avoid using special characters specific to any language. In this case, it would probably be easiest to change the role name to something else and revert to the original name after exporting it. Additionally, it is often a common practice to use English for such purposes. End users usually do not have the capability to configure or invoke roles from debug, so I see no need to create role names specific to any language. Regarding the plugin, I assume that in its original implementation, someone simply did not anticipate such special characters. A possible option, if you have the source code of this plugin, would be to extend its logic to replace special characters when retrieving roles.
@RIsidoro You can customize executor class(executor=“com.sailpoint.pse.plugin.objectexporter.ObjectExporter”) in object exporter task, include those special characters in pattern so that it will not replace with underscore(_).