Adobe Photoshop brushes (.abr) can be prepared from almost any raster graphics format that is supported by the software, so the same applies to WBM format. There is a dedicated brush tool in the software that can help you with the process and you can find numerous guides and tutorials about it on the Internet. But this is not wbm to abr conversion in file conversion sense, just how you make new brushes.
Updated: October 2, 2023