Thank you for responses. I’ll clarify my question a bit.
Main-ActionCenter.xaml shared above uses Document understanding and Validation task. It creates validation tasks and they appear in the default Actions interface.
Preview-kit shared above uses machine learning and OCR (not models trained in Document understanding) and App task for Validation Center. It creates app tasks and they appear in your custom UiPath app.
The problem is - how I can still use Document understanding (like in Main-ActionCenter.xaml) and create App tasks for Validation center which is integrated in my custom app since I need a custom interface for validating documents.
Example:
Data type required by App task: Activities - ContentValidationData Class
Data type output from Document understanding extractor: DataExtraction.IDocumentData
The question is how to convert output from Document understanding extractor (part of IntelligentOCR.ExtractDocumentDataWithDocumentData activity) to input for App task - so I can see a parsed document in my app.