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It is important to understand the data shape and other update functions for building series objects and labels. I would suggest you to go through extensibility document completely before you start implementing custom symbols.
PI Vision Extensibility Documentation : Customizing PI Vision with Extensibility
Extensibility document : https://techsupport.osisoft.com/Downloads/File/98bc271d-9fb6-4317-aa45-30f5c0077558
Additional references : Creating PI Vision Symbols that Interact with Each Other
Hope this helps.