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I wonder if it is possible to later add a listener in compoente grid to take the scroll action? The idea is the same component "On-Demand Data" available in the demo Primefaces: http://www.primefaces.org/showcase/ui/data/datatable/scroll.xhtml
If you’re using the <vaadin-grid> Web Component (not the Framework, server-side Java version), you can do the same thing as shown in the documentation: https://vaadin.com/docs/-/part/elements/vaadin-grid/datasources.html#changing_data_source_size_dynamically (scroll down to the correct "Changing data source size dynamically" example).