  We search for the deep origin of the field-induced
superconductor-to-insulator transitions observed experimentally in
electron-doped SrTiO$_{3}$/LaAlO$_{3}$ interfaces, which were analyzed
theoretically very recently within the framework of superconducting
fluctuations approach (Phys. Rev. B $\bf{104}$, 054503 (2021)). Employing the
2D electron-gas model with strong spin-orbit scatterings, we have found that in
the zero temperature limit, field-induced unbounded growth of the fluctuation
mass, and consequent divergence of Cooper-pair density in mesoscopic puddles,
drives the system to Boson insulating states at high fields. Application of
this model to the gate-voltage tuned 2D electron system, created in the
SrTiO$_{3}$/LaAlO$_{3}$ (111) interface at low temperatures, shows that, at
sufficiently high fields, the DOS conductivity prevails over the
paraconductivity, resulting in strongly enhanced magnetoresistance in systems
with sufficiently small carriers density. Dynamical quantum tunneling of Cooper
pairs breaking into mobile normal-electrons states, which prevent the
divergence at zero temperature, contain the high-field resistance onset.
