ALICE measurements of ungroomed $m_{\rm jet}$ (left) and groomed $m_{\rm jet,\, g}$ (right) using $R=0.2$ charged-particle jets with $40 < p_{\rm T}^{\rm ch \, jet} < 60$ GeV/$c$ in pp and Pb$-$Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV compared to models. The bottom panel shows the ratio of Pb$-$Pb distributions to pp, which quantifies the substructure modifications from quenching.