1.17.1 2d icon in gui && 3d model in hands [SOLVED]

[jpdiv]

Hola! A few days ago I wanted to create a little mod for my server and now I have a few questions.

How can I make an item that will be displayed everywhere as a 2d texture, and in the hands of the character will be displayed as a 3d model?

I am using minecraft json 3d model format.

Right now I have item model with 3d model: /assets/tavernrp/models/item/dice.json

{
    "textures": { ... },

    "elements": [ ... ]
}

And 2d icon: /assets/tavernrp/textures/item/icon/dice.png

How do I need to change dice.json, so that 3d model was drawn only in the hands, and in other places it was 2d icon?

And how can I reduce the size of the model?..

Spoiler

(apologies for potential misspellings, English is not my native language)

[jpdiv]

Thank you, it really worked!

Spoiler

But there was a small problem: the icon in the inventory has become darker than it should be. Can this be fixed?
Also.. can I somehow specify the displayed 3d model scale in the model definition? Some kind of "transform"?

[jpdiv]

Fixed the dark icon this way:

{
	"loader": "forge:separate-perspective",
	"gui_light": "front", // add this
	"base": {
		"parent": "minecraft:item/handheld",
		"textures": {
			"layer0": "tavernrp:item/icon/dice"
		}
	},
	"perspectives": {
		"first_person_right_hand": {
			"parent": "tavernrp:item/dice3d"
		},
                ...
	}
}

[jpdiv]

It works! Thanks! ❤️