  Two-particle correlation functions were measured for $\rm p\overline{p}$,
$\rm p\overline{\Lambda}$, $\rm \overline{p}\Lambda$, and
$\Lambda\overline{\Lambda}$ pairs in Pb-Pb collisions at $\sqrt{s_{\rm
NN}}=2.76$ TeV and $\sqrt{s_{\rm NN}}=5.02$ TeV recorded by the ALICE detector.
From a simultaneous fit to all obtained correlation functions, real and
imaginary components of the scattering lengths, as well as the effective
ranges, were extracted for combined $\rm p\overline{\Lambda}$ and $\rm
\overline{p}\Lambda$ pairs and, for the first time, for
$\Lambda\overline{\Lambda}$ pairs. Effective averaged scattering parameters for
heavier baryon-antibaryon pairs, not measured directly, are also provided. The
results reveal similarly strong interaction between measured baryon-antibaryon
pairs, suggesting that they all annihilate in the same manner at the same pair
relative momentum $k^{*}$. Moreover, the reported significant non-zero
imaginary part and negative real part of the scattering length provide
motivation for future baryon-antibaryon bound state searches.
