armor set + chest loot table

So i'm having a few problems.. 

First off i tried adding a set buff that would give a health boost but this didn't work.

Second problem i'm having issues generating a chest with a loot table

This is the one i currently have however i also had this

And these are the methods i tried to get it generated:

/give @a chest{BlockEntitiyTag:{LottTable:"ns_extra_fun:icecrystal_4"}}
and in the command block.

/data merge block ~ ~-2 ~ {LootTable:"icecrystal_4"}

i tried both of these methos using chests/icecrystal_4 and icecrystal_4 none of my attempts worked. could someone help me out please?