Is it possible to delay sending an ack in netty's socket.io implementation?

Question

While using https://github.com/mrniko/netty-socketio I'm using a queue and a thread pool to process the received data (sorry about the formatting stackoverflow is complaining about spaces when I put the code on different lines):

server.addEventListener("NEW_SELL_ORDER", SellOrder.class, (client, data, ackSender) -> actionQueue.add((connection) -> this.onNewSellOrder(connection, client, data, ackSender)));

The problem is that ackSender isn't usable anymore because the threadpool is processing the request a split second later.

Resulting in the question: is it possible to delay sending an ack in netty's socket.io implementation?

See: https://github.com/mrniko/netty-socketio/blob/master/src/main/java/com/corundumstudio/socketio/AckRequest.java