  The unprecedented statistics of detected Type Ia supernovae (SNe Ia) brought
by the Zwicky Transient Facility enables us to probe the impact of the
Large-Scale Structure on the properties of these objects. The goal of this
paper is to explore the possible impact of the under-dense part of the
large-scale structure on the intrinsic SALT2 light curve properties of SNe Ia
and uncover possible biases in SN Ia analyses. With a volume-limited selection
of ZTF-Cosmo-DR2 Type Ia supernovae overlapping with the SDSS-DR7 survey
footprint, we investigate the distribution of their properties with regard to
voids detected in the SDSS-DR7 galaxy sample. We further use Voronoi volumes as
proxy for local density environments within the large-scale structure. We find
a moderate dependency of the stretch toward the localisation around the void
centre and none when considering colour. The local Voronoi volumes mostly
affect the fraction of low/high stretch supernovae. With the current statistics
available, we consider that the impact of high or low local density environment
can be considered as a proxy for the colour of the host galaxy. Under-dense
environments should not cause any biases in supernova analyses.
