How to force BC1 texture compression?

Development Rendering
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1

Hey! I have texture mask, where I sample values from. It has 3 channels.
When I use default compresson setting. i.e. DXT1/BC1, compression is always DXT1

2

Bump. Wouldn’t BC1, with 1-bit alpha, be perfect for alpha-masked shaders (leaves, fences etc.)?