Add parameter to texture inspector

I need to do some processing with AssetPostprocessor.OnPostprocessTexture on some texture and I'm curious to know if it's possible to add custom parameter in the texture inspector. Like a boolean to know if I need to postprocess or not this texture.

If it's not possible, the only other solution I found to know if I need to postprocess this texture is to add some prefix/suffix in the filename or put the texture in a specific folder. But I really hate hardcoding some stuff in filename/folder, so I hope there's another solution.