  The quest for topological states in strongly correlated materials is
challenging but essential from fundamental research and application
perspectives. The magnetic Weyl semimetal (WSM) state in the chiral
antiferromagnet Mn$_3$Sn emerges with strong electronic correlations, offering
an intriguing arena for exploring the interplay between Weyl fermions and
correlation physics. One prominent characteristic of the WSM state is the
chiral anomaly, yet the potential effects of electronic correlations on the
chiral anomaly remain unexplored. Here, we report a comprehensive study of the
in-plane magnetotransport properties of single-crystal Mn$_{3+x}$Sn$_{1-x}$
with three different Mn doping levels ($x=0.053$, 0.070, and 0.090). The excess
Mn leads to glassy ferromagnetic behavior and the Kondo effect, aside from
shifting the chemical potential relative to the Weyl nodes. Thus, systematic
tuning of the Mn doping level enables us to study the interplay between the
spin-fluctuation scatterings, the correlation effect, and the chiral anomaly.
We identify negative longitudinal magnetoresistance and planar Hall effect
specific to the chiral anomaly for all three doping levels, indicating that the
chiral anomaly persists in the presence of strong correlations.
