how to configure DXT compression options

I can’t import specifically designed .DDS files into unreal so I’m having to rely on unreal’s conversion abilities to convert uncompressed textures for my project. However, I can’t find a way to configure DXT compression parameters when selecting the DXT format.

For example, BC7 has a myriad of colour depths and bit distributions available, but unreal doesn’t seem to be exposing those options. Is there something that I’m missing as this seems like a standard thing to configure in a production-ready engine, especially when planning a channel packing workflow.

Thanks