(top) Normalized transverse momentum correlator, $\sqrt{ \langle\langle \Delta p_{{\rm T}1}\Delta p_{{\rm T}2} \rangle\rangle } /\langle/\langle p_{\rm T} \rangle\rangle $, shown as a function of the charged-particle multiplicity density, $\langle{\rm d}N_{\rm ch}/{\rm d}\eta \rangle$, measured in the pseudorapidity range $|\eta| < 0.8$ in pp collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV, Xe$-$Xe collisions at $\sqrt{s_{\rm NN}} = 5.44$ TeV, and Pb$-$Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV; (bottom) Ratio of values of $\sqrt{ \langle\langle \Delta p_{{\rm T}1}\Delta p_{{\rm T}2} \rangle\rangle } / \langle\langle p_{\rm T} \rangle\rangle $ measured in pp and Xe$-$Xe collisions to those observed in Pb$-$Pb collisions. Statistical and systematic uncertainties are represented by vertical bars and boxes, respectively.