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Custom Item descriptions on server side 1.15

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I have been working on a custom item system where a lot of item properties exist, like vitality, dexterity and many others.
This works fine by adding to the NBT of the ItemStack and I can also query the values just fine, however I have a problem displaying these to the user.
My mod runs exclusively on the server side, so I can't use ItemTooltipEvent sadly, but that is exactly what I would have needed.
I assume I could change the lore and do tricks with that to have it show, but I couldn't get the lore to show properly, I was trying to put my data into the NBT tag.
And I also can't remove the default information thing that items display, like armors have "+x Armor" which is awful for my use case as I implement my own armor system.

I also need to be able to generate these descriptions on the fly, real time, because I want to be able to change how attributes work/are displayed.
So as an example if I put +1 Vitality on an item, and want to display it as "+2 To Life" not as vitality, but then I change my mind, and want to update how item information is displayed.
This may sound dumb, but I want to be able to patch items and their properties and if their description is just a static string, even if I change how the underlying data works, I can't change the description.
Take that example, what if I decide to change vitality to give +3 life per point not 2, I wouldn't need to change the item's data at all, just the description.

I hope I was clear, I'll be around if I need to clear anything up,

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I was hoping there was some method to catch when the client is looking for the description and instead of going through the standard way of getting it from the NBT I could supply it with different data, but then the whole NBT is passed to the client, and it decides on how to display it if I understand correctly so yeah out of luck, I will look into regenerating the item Lore some way when something changes

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Yeah well I see, as for using the lore tag...
How do I produce this structure in the NBT?


The CompoundNBT interface is quite different from json libraries I am used to, I cant figure out how can I add a json object array to lore

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First get the display tag: ItemStack#getOrCreateChildTag("display"). That will give you a CompoundNBT. Then you can use CompoundNBT#getList("Lore", Constants.NBT.TAG_COMPOUND) to get the "Lore" list. then add whatever CompoundNBT entries you want to the list and use CompoundNBT#put("Lore", list) to put the changed list back in the NBT compound. 

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