localuser.lua

function sequence_item_by_name(sequence_name, group_name, item_name)
    local seqitem
    if group_name then
        local idx = table.find(sequences.arcade, function (k, v) return v.name == group_name end)
        seqitem = table.find(sequences[sequence_name][idx], function (k, v) return type(v) == "table" and v.name == _(item_name) end)
        if seqitem then 
            return group_name, seqitem 
        end
    end

    -- no group_name or the wrong one was given, try searching the level in ALL groups
    for i, g in pairs(sequences[sequence_name]) do
        seqitem = table.find(g, function (k, v) return type(v) == "table" and v.name == _(item_name) end)
        if seqitem then 
            return g.name, seqitem
        end
    end
end

local LLL_sequence_name = 'arcade'
local LLL_group_name    = 'reflection'
local LLL_item_name     = 'boost_intro'
local LLL_item_idx = 1

LLL_group_name, LLL_item_idx = sequence_item_by_name(LLL_sequence_name, LLL_group_name, LLL_item_name)
selected_next= {
    sequence_name = LLL_sequence_name,
    group_name = LLL_group_name,
    item_idx = LLL_item_idx
}