class ExampleUserPlugin : Plugin<ExampleUserPlugin>
{
    protected override void Configure()
    {
        InPhase(BuildPhase.Transforming).Run("Generate textures", ctx => {
            // Do not need to compress generated textures in user plugins.
            var tex1 = GenerateTexture();

            // Can override format and quality.
            var tex2 = GenerateTexture();
            TextureCompressor.Register(tex2, TextureFormat.ASTC_8x8, TextureCompressionQuality.Best);

            // assign tex1 and tex2 to materials, etc.
        });
    }
}