I don't think so.
One workaround might be using sharpen filters to get rid of soft edges.
Set the layer to draft quality or use the Stylize --> Mosaic effect.
Thank you for the answers;
I forgot to state that my intention is to use pixel-fonts (like this for example) and I don't want AE to "dirt" them with extra pixels at all (with antialias or subpixels).
It is important that the grid of pixels of every character (say, for example 8x8 pixel square), is preserved.
With draft mode and even with contrast filters, pixels are added, and this is no good for the scope of the project.
By the way, i need to output some advertising videos on this outdoor ledscreen, and the resolution is 90x67px!