For x264, x265 only with the CLI and by pipping to a pre install Ffmpeg version… Check here how to 
Topaz's ffmpeg binary doesn't contain libx264 or libx265 - #5 by 07broom.fibulae
For Av1 also with the CLI but it’s Ffmpeg encoding ( libaom-av1 ) and it’s slooooooow like a snail. For AV1 I advice to use an external encoder capable of splitting the given video file into chunks because is faster
