Solved
Please refer to page 36/48 of below PTC docu about how to create Property/Event for Edge Virtual Thing.
About reading from config-file, please refer to MS .Net online help.
Edge .NET SDK Developer's Guide Version 5.7.4
https://www.ptc.com/support/-/media/6B0DF73A1FD54523B4002D4A18B20B7B.pdf?sc_lang=en
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