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You could store the values in a global table indexed by packet number.

https://gitlab.com/wireshark/wireshark/-/wikis/Lua/Examples/filtcols

-- variables to persist across all packets
local pkt_data = {} -- indexed per packet

pkt_data.protocol = {}
pkt_data.info = {}

    if  cols_protocol ~= "(protocol)" then
        pkt_data.protocol[pinfo.number] = cols_protocol
    end

You could store the values in a global table indexed by packet number.

https://gitlab.com/wireshark/wireshark/-/wikis/Lua/Examples/filtcolsfiltcols - A post-dissector to allow filtering on Protocol and Info column

-- variables to persist across all packets
local pkt_data = {} -- indexed per packet

pkt_data.protocol = {}
pkt_data.info = {}

    if  cols_protocol ~= "(protocol)" then
        pkt_data.protocol[pinfo.number] = cols_protocol
    end