Design miniature 220 to 12vac 50Watt electronic transformer with 12 to 3.3vdc output for Mcu

would to replace a machnical transformer to electric one in order to activate 12vac RGB led line with an esp32 wifi controller. need a eagle schematic and a bom MUST BE minimum physical size !! i'm adding the schematic for the current design with the "big" machanical transformator that need to replace to a small size electric one/