file without extension will have some wrong

[dwhmofly]

the comressed file extension will be "..br" (brotli) use --output-file-format [filename].[compressExt].[ext] will be ".br."

Is it possible to add a option [ext?] and use --output-file-format [filename].[compressExt][ext?] will be ".br"(without extension) or ".br.xx" (with extension)