Blazor webassembly - get child entities

Please help with getting parent's child collection in blazor webassembly.
By default, Radzen generate navigation properties with [JsonIgnore] attribute, so child entities doesn't serialize into object graph, even if $expand method is applyed.
If you redefine a model without an [JsonIgnore] attribute, you can get a parent entity with child collection, but there will be difficulties with updating the entity using the oData PATCH method