Hide slice in a frame

In the .ase file specs for a Slice Chunk, it says the slice width “can be 0 if this slice hidden in the animation from the given frame”. I’m importing .ase files directly for a game engine I’m working on, and this functionality seems like something I want to make use of to “disable” a slice on specific frames.

However, in Aseprite, I can’t find how you would make this happen - I can’t find any buttons to hide a slice or anything in slice properties that hides it, and when I try to manually set the width to 0, it seems to clamp it to at least 1 automatically.

Is this implemented yet? If not, is there a way I can write a script or something that would be able to set a slice width to 0 when exporting the file or something of the like?