Link request and response packets in Lua Dissector

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As far as I found, linking between multiple packets is made via "conversation" functions. Sadly, according to this question, it's not implemented in Wireshark yet.

My response packet doesn't contains command type, which contains request packet, so only way to parse the response is by getting requests command type. I can match them by sequence number, but since there is no conversations implemented, I have no other ideas how to get the request's packet information.

Is there any workarounds how to do this in Lua?