Please, what are the XML annotations needed in a Fiori Elements Object Page in order to display a table in it? This app is not a RAP one, this is OData service with gateway (SEGW).
Example: Main Entity Purchase Orders and in Object Page display all PO Items.
You need to add ReferenceFacet annotations that point to the LineItem annotation.
ReferenceFacet annotations will create a new section in the Object Page. The LineItem annotation will add a table to it.
More details you can find in the documentation.
Facet annotation:
<Annotation Term="UI.Facets">
<Record Type="UI.ReferenceFacet">
<PropertyValue Property="ID" String="to_Children"/>
<PropertyValue Property="Target" AnnotationPath="children/@UI.LineItem"/>
<PropertyValue Property="Label" String="{@i18n>CHILDREN_LABEL}"/>
</Record>
</Annotation>
LineItem annotation
<Annotations Target="MyService.Children" xmlns="http://docs.oasis-open.org/odata/ns/edm">
<Annotation Term="UI.LineItem">
<Collection>
<Record Type="UI.DataField">
<PropertyValue Property="Value" Path="FullName"/>
</Record>
<Record Type="UI.DataField">
<PropertyValue Property="Value" Path="Age"/>
</Record>
<Record Type="UI.DataField">
<PropertyValue Property="Value" Path="EyeColor"/>
</Record>
</Collection>
</Annotation>
</Annotations>