Use AppIntents to parse user's speech and support direct parameter parsing

How to use AppIntents to parse user's speech and support direct parameter parsing?

when i use AppEntity like this：

@Parameter(title: LocalizedStringResource(stringLiteral: "SIRI_END"), requestValueDialog: "where you go")
var end: MapPoiAppEntity

in MapPoiAppEntity

Siri must first ask a question, and the user must answer before this method can be executed：

func entities(matching string: String) async throws -> [MapPoiAppEntity] 

For example, if the user wakes up Siri and directly says, "I want to take a taxi to San Francisco," this method will not be executed, and the parameters will not be parsed.

I later discovered that I must first feed the data to this method in order to parse it.

    func suggestedEntities() async throws -> [MapPoiAppEntity] {
   
        print("identifier-> suggestedEntities")

        let items = Self.saveItems
        return items
    }

This way, the destination can only be a limited list, and it cannot be used extensively. Why can't you just give me the destination directly in the "func entities(matching string: String)" method?

This is a knowledge point that I have not yet understood. If that's the case, please provide guidance. Or is it a design limitation from Apple that the dynamic parameter parsing can only have a limited list? Please tell me.