Lua make npc sell bag with items

[FilipeJF]

Is there a way to make NPC sell a bag with items in the trade window, like, we have it:

<?xml version="1.0" encoding="UTF-8"?>
<npc name="Ghuka" script="data/npc/scripts/ghuka.lua" walkinterval="1000" floorchange="0">
    <health now="100" max="100"/>
    <look type="29" head="20" body="100" legs="50" feet="99" addons="1"/>
    <parameters>    
        <parameter key="message_greet" value="Saudações! ({missão}, {troca})" />
        <parameter key="message_walkaway" value="Volte sempre!"/>
        <parameter key="message_farewell" value="Volte sempre, |PLAYERNAME|!" />
        <parameter key="message_idletimeout" value="Próximo!" />
        <parameter key="message_sendtrade" value="Aqui tem tudo que você precisa para forjar os mais valiosos dos equipamentos!"/>
        <parameter key="module_shop" value="1"/>
        <parameter key="shop_buyable" value="braseiro vivo,5468,10;martelo de forja,4846,40;picareta,2553,25;faca de caça,2402,25;machado,2386,25;flecha,2544,1" />
        <parameter key="shop_sellable" value="" />
    </parameters>
</npc>

Is there a way to add a bag with arrows in there?