simple png sequence alpha output

[kurageart]

Hello, I'm probably asking something extremely trivial, but is there a way to obtain a plain png sequence including only the masked area (the character) and no background (background as alpha channel)? .
I guess that this is something the plugin handles itself, before merging the masked "ebsynthed" area with the background.
This can obviously easily be done in compositing, by using the masked image sequence as the source for alpha, but it is an extra step that I could like to skip :)
I noticed a button called "send to after effects" on the windows ebsynth interface, but I'm on linux and I don't use AE for compositing...