zstd compression level not possible?

[mzealey]

In

httpcompression/adapter.go

Lines 210 to 216 in 102a9fb

	func BrotliCompressionLevel(level int) Option {
	c, err := brotli.New(brotli.Options{Quality: level})
	if err != nil {
	return errorOption(err)
	}
	return BrotliCompressor(c)
	}

gzip, br, deflate compression levels are configurable via option but I cannot see zstd level? It would be nice to have.