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