Yes. Pick the 3D Models gamemode and describe a weapon, mob, prop, hat or armor set: Codella builds it cube by cube in Blockbench's own format, paints one texture sheet over it and animates it, all live in a 3D viewer. Download the .bbmodel, or export a ready-to-install pack for ItemsAdder, Oraxen, MythicMobs (ModelEngine) or MythicArmors from the Integrations tab.