Function encode_rois 

pub fn encode_rois(
    rois: &[Array2<u8>],
    ctx: Jbig2Context,
) -> Result<(Option<Vec<u8>>, Vec<Vec<u8>>), Box<dyn Error>>

Encodes a list of text-only binary PBM ROIs into JBIG2 streams.

Arguments

• rois - A slice of 2D arrays where each array represents a binary image (0/255 or 0/1 values)
• ctx - JBIG2 encoding context with configuration