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Using the chiral unitary approach in coupled channels and $SU(3)$ symmetry wedescribe the production of $f_0(500)$, $f_0(980)$ and $a_0(980)$ in the$\chi_{c1} \to \eta \pi^+ \pi^-$ reaction, recently performed by the BESIIIcollaboration. A very strong peak for the $a_0(980)$ can be seen in the$\eta\pi$ invariant mass, while clear signals for the $f_0(500)$ and $f_0(980)$appear in the one of $\pi^+\pi^-$. Next, we make predictions for the analogousdecay $\eta_c \to \eta \pi^+ \pi^-$, which could also be measuredexperimentally. We discuss the differences of these reactions which areinteresting to test the picture where these scalar mesons are dynamicallygenerated from the interaction of pairs of pseudoscalars.

Production of $f_0(500)$, $f_0(980)$ and $a_0(980)$ in the $\chi_{c1} \to \eta \pi^+ \pi^-$ and $\eta_c \to \eta \pi^+ \pi^-$ decays