See blender/blender-assets@c02a78249c. The essentials asset library now features the bundled brushes as brush assets. This is in preparation for the brush assets project merge, see #116337. There's no real reason to wait with merging these, even if merging the rest of the assets project may take a few days still. These brush assets will not show up in the asset browser yet, since brush assets are still considered an experimental feature in the main branch.