  The link between ordinary Standard model (SM) photon and both dark photon and
axion like particle (ALP) can be introduced through the dark axion portal
coupling. Given the dark axion portal setup, in the present paper we refer the
dark photon as the mediator between SM and dark matter (DM) particles, implying
that it decays predominantly into pair of DM fermions. Furthermore, we discuss
in detail the implication of the dark axion portal scenario for the lepton
(electron and muon) fixed target experiments. In particular, for the specific
fixed target facility we study the missing energy signatures of the dark photon
production followed by its invisible decay into stable DM particles. We
investigated the potential to probe dark axion portal vertices with regarding
signatures and derive the expected sensitivities of NA64$e$, NA64$\mu$, LDMX
and $\mbox{M}^3$. Moreover, we estimated the expected reach of NA64$e$ from the
projected statistics of the $J/\psi$ vector meson invisible decays. We also
recasted BaBar monophoton bounds for the specific dark axion portal scenario.
In addition, we modified the dark axion portal setup by including in the model
both the hadron and lepton specific ALP couplings. As the result, we obtain the
bounds on the combination of fermion-specific couplings of ALP from the fixed
target experiments. We discuss the implication of the modified dark axion
portal scenario for the electric dipole moments (EDM) of SM fermions. In
addition, we derived the novel constraints on the combination of the
$CP$-violating neutron-specific ALP couplings from the existing bounds on
neutron EDM by taking into account the neutron anomalous magnetic moment.
