Based on @CouchDeveloper and your own reply, you can create/add those global function overloads possibly to keep the same ergonomics:

func autoreleasepool<Result>(_ perform: @escaping () async throws -> Result) async throws -> Result {
    try await Task {
        try await perform()
    }.value
}

func autoreleasepool<Result>(_ perform: @escaping () async -> Result) async -> Result {
    await Task {
        await perform()
    }.value
}