  Using the 0.9--4.4~$\mu$m imaging data from the James Webb Space Telescope
(JWST) Early Release Observation in the SMACS J0723.3-7327 galaxy cluster
field, we discuss the properties of three submillimeter galaxies (SMGs)
detected by the Atacama Large Millimeter Array. These sources are magnified by
1.4--2.1$\times$due to gravitational lensing. This is the first time that SMG
host galaxies are resolved in the rest-frame near-infrared (NIR). One source
was previous undetected by HST, while the remaining two are disk galaxies with
S\'ersic indices of $\sim 0.9$ and star formation rates on or just below the
star formation "main sequence". Their submillimeter emission originates from
the inner parts of the hosts, suggesting that their dust contents are
concentrated towards the center. The host half-light radii measured in the
rest-frame NIR are $\sim$1.5$\times$ smaller than those measured in the
rest-frame optical, consistent with a concentrated dust distribution. The more
severe extinction that optical light suffers towards the center makes it
seemingly less concentrated. Therefore, we expect that the optically-based
determination of the stellar mass distribution within host galaxies could still
be severely biased by dust. Interestingly, these two disk galaxies are
dramatically different in their outer regions, with one being star forming and
the other being quiescent. Upcoming JWST observations of statistically
significant samples of SMGs will allow us to understand the correlation between
the dusty star forming regions and their hosts.
