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How to add a column from ProtoField value

Hi, I wrote a Lua dissector script to capture a in-house developed protocol. I want to add a column "source" "target" into wireshark view. I can add protocol name but how can I add a column called source and assign it a value from ProtoField? I tried pinfo.cols.source = but I get error.

local mybussnifer_can = Proto("mysniffer", "Sniffer plugin")
local can_protocol_fields = mybussnifer_can.fields

can_protocol_fields.priority  = ProtoField.string("priority", "Priority")

can_protocol_fields.proto_dataformat = ProtoField.uint8("dataformat" , "DFormat ", base.HEX, protocol.str, nil, "Protocol Format")

can_protocol_fields.source = ProtoField.uint8("mysniffer.source", "Source", base.HEX, services.name_str , nil, "Source ID") = ProtoField.uint8("" , "Target", base.HEX, services.name_str , nil, "Target ID")

function mybussnifer_can.dissector(buffer, pinfo, tree)
    local buf_len = buffer:len()
    local offset = 0 
    local packet_len = f_frame_len().value
    local subtree = tree:add(mybussnifer_can, buffer(offset, packet_len))
    pinfo.cols.protocol =