  We present chemical abundance ratios of 70 star-forming galaxies at
$z\sim4$-10 observed by the JWST/NIRSpec ERO, GLASS, and CEERS programs. Among
the 70 galaxies, we have pinpointed 2 galaxies, CEERS_01019 at $z=8.68$ and
GLASS_150008 at $z=6.23$, with extremely low C/N ([C/N]$\lesssim -1$),
evidenced with CIII]$\lambda\lambda$1907,1909, NIII]$\lambda$1750, and
NIV]$\lambda\lambda$1483,1486, which show high N/O ratios ([N/O]$\gtrsim 0.5$)
comparable with the one of GN-z11 regardless of whether stellar or AGN
radiation is assumed. Such low C/N and high N/O ratios found in CEERS_01019 and
GLASS_150008 (additionally identified in GN-z11) are largely biased towards the
equilibrium of the CNO cycle, suggesting that these 3 galaxies are enriched by
metals processed by the CNO cycle. On the C/N vs. O/H plane, these 3 galaxies
do not coincide with Galactic HII regions, normal star-forming galaxies, and
nitrogen-loud quasars with asymptotic giant branch stars, but globular-cluster
(GC) stars, indicating a connection with GC formation. We compare C/O and N/O
of these 3 galaxies with those of theoretical models, and find that these 3
galaxies are explained by scenarios with dominant CNO-cycle materials, i.e.
Wolf-Rayet stars, supermassive ($10^{3}-10^{5}\ M_{\odot}$) stars, and tidal
disruption events, interestingly with a requirement of frequent direct
collapses. For all the 70 galaxies, we present measurements of Ne/O, S/O, and
Ar/O, together with C/O and N/O. We identify 4 galaxies with very low Ne/O,
$\log(\rm Ne/O)<-1.0$, indicating abundant massive ($\gtrsim30\ M_\odot$)
stars.
