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Thanks for using Syncfusion products.
We suggest you to use node “AddInfo” property to achieve your requirement. Please refer the code snippet and sample below.
Node node = new Node();
Dictionary<string, object> addinfo = new Dictionary<string, object>();
node.AddInfo = addinfo;
Please refer the below knowledge base link which represents how to add custom properties to nodes and connectors.
Please let me know if any concerns.