How to enable V2G protocol(DIN70121 and ISO15118)?

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There is V2G dissector in https://github.com/geynis/v2g-ws-diss... (as Lua plugin).

Supporting V2G service discovery and V2GTP.

To enable dissection of those protocols, somebody would have to write code to add support to Wireshark for them. As Wireshark currently has no dissectors for them, there's no option to enable them in existing versions of Wireshark.