3d item

[blazing idol]

How can i make the item It appears in the player's hand in a 3d form ?

[verbal trout]

?attachables

[buoyant moat]

3D Items

Attachables are a system in resource packs to give items custom models and animations when held.
https://wiki.bedrock.dev/items/attachables.html

[jovial stream]

if you are talking about how swords are held, you can put
minecraft:hand_equipped: true