How to load a texture2d with mipmap0 when the memory budget is full

Unity Engine
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1

Hello,
My project has streaming turned on, and uses the default streamingMipmapsMaxLevelReduction (2).

When the project’s memory budget reaches its limit and I want to load a very important Texture2d, how do I load the mipmap0 level.
I tested it and the only Texture2d loaded into memory are mipmap2
This Texture2d must have mipmap & streaming enabled.

Many thanks!