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It is pointed out that the diagonal amplitude of the $E1-E1$ chromo-electricinteraction with soft gluon fields (chromo-polarizability) can be measureddirectly for the $J/\psi$ and $\Upsilon$ resonances in the decays $J/\psi \to\pi \pi \ell^+ \ell^-$ and $\Upsilon \to \pi \pi \ell^+ \ell^-$ with softpions. For the $J/\psi$ this amplitude is often discussed in connection withthe $J/\psi$ interaction with nuclear matter, while for the $\Upsilon$ thechromo-polarizability enters the estimates of the non-perturbative mass shiftof the resonance relevant to precision determination of the $b$ quark mass fromthe $\Upsilon$ mass.Comment: 6 page

QUARKONIUM CHROMO-POLARIZABILITY FROM THE DECAYS J/ψ(ϒ)→ππℓ+ℓ-

QUARKONIUM CHROMO-POLARIZABILITY FROM THE DECAYS J/ψ(ϒ)→ππℓ⁺ℓ^-