Reuse (part of) a Wireshark Dissector

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I'm writing a dissector in LUA for a protocol we use internally between our processes. In those messages, we send some TFT which are basically the same we found in S1AP and GTPv2 protocols. I was wondering if there is a way in LUA to load the TFT decoding part of S1AP or GTPv2 instead of writing my own TFT decoder in LUA. Thanks