  Detection of the first stars has remained elusive so-far but their presence
may soon be unveiled by upcoming JWST observations. Previous studies have not
investigated the entire possible range of halo masses and redshifts which may
help in their detection. Motivated by the prospects of detecting galaxies up to
$z\sim 20$ in JWST early data release, we quantify the contribution of Pop III
stars to high-redshift galaxies from $6 \leq z \leq 30$ by employing the
semi-analytical model A-SLOTH, which self-consistently models the formation of
Pop III and Pop II stars along with their feedback. Our results suggest that
the contribution of Pop III stars is the highest in low-mass halos of $\rm
10^7-10^9~M_{\odot}$. While high-mass halos $\rm \geq 10^{10}~M_{\odot}$
contain less than 1\% Pop III stars, they host galaxies with stellar masses of
$\rm 10^9~M_{\odot}$ as early as $z \sim 30$. Interestingly, the apparent
magnitude of Pop~III populations gets brighter towards higher redshift due to
the higher stellar masses, but Pop~III-dominated galaxies are too faint to be
directly detected with JWST. Our results predict JWST can detect galaxies up to
$z\sim 30$, which may help in constraining the IMF of Pop III stars and will
guide observers to discern the contribution of Pop~III stars to high-redshift
galaxies.
