Left: Excess dielectron $p_{\rm T,ee}^{\rm 2}$-differential yields after subtraction of the cocktail of known hadronic decay contributions in peripheral (70--90\%) Pb--Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV for different $m_{\rm ee}$ ranges, i.e. $0.4 \leq m_{\rm ee} < 0.7$ GeV/$c^2$, $0.7 \leq m_{\rm ee} < 1.1$ GeV/$c^2$, and $1.1 \leq m_{\rm ee} < 2.7$ GeV/$c^2$, compared with calculations for coherent photon--photon production of dielectrons folded with the detector resolution. Right: Excess dielectron $p_{\rm T,ee}^{\rm 2}$-differential yields after subtraction of the cocktail of known hadronic decay contributions in peripheral Pb--Pb (70--90\%), Au--Au (60--80\%) and U--U (60--80\%) collisions at $\sqrt{s_{\rm NN}}$ $=$ 5.02, 0.2 and 0.193 TeV, respectively, in a similar $m_{\rm ee}$ range. The error bars and boxes represent the statistical and systematic uncertainties of the data, respectively. Arrows indicate upper limits at 90\% confidence level.