  In this study, we investigate the consequence of the constant-roll condition
and examine the role of $f(Q,T)$ gravity in the cosmological inflation process.
We analyze the inflationary scenario by calculating modified Friedmann
equations, and giving an alternative technique that enables relating modified
slow-roll parameters to the constant roll parameter $\beta $. Considering both
chaotic and hilltop models, we calculate the spectral index and the
tensor-to-scalar ratio and compare their compatibility with Planck's data for
different choices of the constant roll parameter $\beta $. We examine the
evolution of primordial black holes in our chosen modified gravity model taking
into account the accretion process and the evaporation due to Hawking
radiation. We compute the evaporation and accretion masses rate and provide an
analytic estimation of the primordial black holes masse and of the radiation in
the $f(Q,T)$ gravity model.
