lua module for HAProxy to perform SNI on RDP

i need an implementation of RDP SNI redirection in lua for HAProxy. See attachment for an example with iRules on f5 I will require the lua code and example config for haproxy to get this working, ideally with the backend specified within HAProxy and the lua just performing initial negation to get the sni from the payloads. Message me for more information on what is needed if you are unsure