| This answer is opinion-based.|
Due to lack of canonical information in the franchise, there is no definite answer to this question.
Perhaps. The Kung Fu Panda 2 opening dialogue mentions Shen seeing "dark power" from his experiments with the fireworks, which may indicate that he already envisioned weaponizing it into cannons, but his specific goals of doing so (including ruling China) were never mentioned. His facial expression seemed to hint as such, however.