Conventional thermoelectric conversion based on charge transport faces significant challenges due to inherent limitations, such as a low power factor, inevitable Joule heating, and high thermal conductivity. To address these challenges, spin caloritronics offer a promising pathway for thermoelectric conversion based on the spin degree of freedom, which has attracted considerable interest because of its low energy consumption and high response speed. In this study, we systematically investigates the gate-voltage-tunable spin caloritronic properties of transition metal (Fe/Cr)-doped Janus MoSeTe...