How to specify the color type as linear when setting the texture for the material instance

[zhenhuafan]

I'm converting a material in Gltf to Filament and setting the parameters in code.
But there are two color type in some material, I think the right code like below is for SRGB：

Instance.setParameter("Param1", IoUtils.loadTextureAssets(engine, this,
"texture1.png",IoUtils.Companion.TextureType.COLOR)!!, sampler)

My question is what's the right code for ColorType：Linear ？

The Material parameters is like below:
"Param1":
{
"colorspace": "srgb",
"texture": "texture1"
},
"Param2":
{
"colorspace": "linear",
"texture": "texture2"
},

Any guidance I would be very grateful！