This device uses WB2S module which needs to be replaced with ESP-02S, WT-01N or WT32C3-01N . Besides the module, this process will require a heat gun, soldering tools and moderate soldering skill. Read more about module replacement in a detailed guide.
Easy to open, remove module and re-solder as it has plenty of space inside.
Compatible module ESP-01N (WT-01N) has to be flashed and soldered in with Tasmota inside. I think soldering first and flashing while soldered might not work as there is serial data on RX pin from HLW8032.