Acess to Blend value for LUT in code

Hi community,

I add an LUT for my passthrough and I need to adjust  "blend" value of this LUT into a script but I don't found how to change this value in code, while animator seems to be able to access it. How can I change the blend value into code ? I don't found the answer in documentation, I just found that this value is named lutWeight in OVR library. but it's not exposed value.

For now I make the transition with an animator, but it's not very flexible.

thx you all for future answers !