We present recent progress in constructing heavy quarkonia light-front wave functions from the light-front quark model, a relativistic framework well-suited for describing partonic structure and hadronic form factors. In this proceeding, we discuss the recent application of the model to the $M1$ radiative transition, such as $J/\psi \to \eta_c \gamma$, among other transitions.
Additionally, we compare our results on the transition form factor with available lattice QCD data.
These show our efforts to deepen our understanding of the structure of heavy quarkonia from light-front model perspective.