So according to this video by phoenix sc:
.You can make a crossbow that can shoot like millions of arrows and the command is in the description of the video which is :
give @p minecraft:crossbow{Enchantments:[{id:"minecraft:multishot",lvl:1s},
{id:"minecraft:quick_charge",lvl:5s}],ChargedProjectiles:[{id:"minecraft:arrow",Count:1b},
{id:"minecraft:arrow",Count:1b},{id:"minecraft:arrow",Count:1b}],Charged:1b}
Apparently, if you type in the command, the crossbow will only shoot 3 arrows. How can you fix this so it can turn into billions of arrows when shoot?