How to replace shield texture with item?

[Anderson]

Is there a way to replace the shield texture with an item, for instance a steak, so it shows a steak in my offhand instead of the shield?

I'm using version 1.19

Thanks in advance.

[Kadir]

Well as you might know, a Resource Pack's goal is to replace textures so I guess if you create / edit one, you can replace the Shield texture by a Steak texture.
If you are talking about the shield that pops up in certain server when you right click, I guess it should be the same thing.

Take a look https://texture-packs.com/resourcepack/default-pack/ to download a template of the basic Minecraft texture pack. Shield texture is here /assets/minecraft/textures/entity/
As you have shield_base_nopattern.png and shield_base.png, the difference is that the no_pattern is for the shield that has no banners applied. The other one is for the shield with the banner applied, the banner substitutes the white of the shield.