  The requirements for hadron polarimetry at the future Electron Ion Collider
(EIC) include measurements of the absolute helion (${}^3\text{He}$, $h$) beam
polarization with systematic uncertainties better than
$\sigma^\text{syst}_P/P\lesssim1\%$. Here, we consider a possibility to utilize
the Polarized Atomic Hydrogen Gas Jet Target (HJET) for precision measurement
of polarization of the $\sim$100 GeV/n helion beam. HJET, which serves to
determine absolute proton beam polarization at the Relativistic Heavy Ion
Collider, provides the accuracy of about $\delta^\text{syst}P/P\sim0.5\%$.
Potential problems for adapting the HJET method for the EIC helion beam include
(i) necessity to know the ratio of $p^\uparrow{h}$ and $h^\uparrow{p}$
analyzing powers $A_\text{N}^{ph}(t)/A_\text{N}^{hp}(t)$ with high precision,
({ii) possible beam ${}^3\text{He}$ breakup, and (iii) operation in a 10 ns
bunch spacing beam. Preliminary results of an analysis discussed here indicate
that the listed problems can be overcome and the helion beam absolute
polarization can be measured by HJET with the required accuracy.
