Add default value to async function in protocol

I'd like to add a default value to my async function. With completion handlers I can do it like this:

public protocol ServiceProtocol {
    func getData(from startDate: Date, completion: @escaping (Result<MyModel, MyDefinedErrors>) -> Void)
}

// Protocol default values
extension ServiceProtocol {
    public func getData(completion: @escaping (Result<MyModel, MyDefinedErrors>) -> Void) {
        getData(
            from: Date(timeIntervalSince1970: 0),
            completion: completion
        )
    }
}

class MyClass: ServiceProtocol {
    
    func getData(from startDate: Date, completion: @escaping (Result<MyModel, MyDefinedErrors>) -> Void) {
        // some stuff here
    }
}

But how can I do it using async? Here's the function I'm trying to convert:

func makeApiRequest<T: Decodable>(modelToDecode: T.Type, url: String, headerKey: String? = "", headerValue: String? = "", timeInterval: TimeInterval? = .infinity) async -> Result<T, NetworkError>