  Parity- and time-reversal-symmetry violating interaction constants required
for the interpretation of a recent measurement (arXiv:1704.07928
[physics.atom-ph]) of corresponding symmetry violations in the $\Omega=1$
(${^3\Delta}_1$) science state of the HfF$^+$ molecular ion are reported. Using
a relativistic four-component all-electron multi-reference configuration
interaction model the nucleon-electron scalar-pseudoscalar interaction constant
is determined as $W_S = 20.0$ [kHz]. An updated result for the electron
electric-dipole-moment effective electric field of $|E_{\text{eff}}| = 22.7
\left[\frac{\rm GV}{\rm cm}\right]$ is obtained. Further results of relevance
in the context of the search for leptonic charge-parity violation such as
magnetic hyperfine interaction constants and electronic $G$-tensor for HfF$^+$
are presented.
