The 212 by itself will not take you to the Hamden Shopping Plaza on Dixwell. You could, however, board the 212 bus and stay on as it reaches its last station Downtown. The bus should continue on as 238, which will take you to the Hamden Shopping Plaza. Alternatively, you can walk to Chapel St / Church St and just board the 238 there.

Download the transit app for better and clearer instructions for the bus. The bus is free till March 31, 2023 (for now).