In the present work, $k_T$-factorization formalism is applied to compute exclusive dilepton production by timelike Compton scattering (TCS) in $eA$, $pA$ and $AA$ collisions. The nuclear effects are investigated considering heavy light ions. cross section terms of invariant mass rapidity distribution lepton pair shown. analysis done for electron-ion collisions at Large Hadron-Electron Collider ...