  We investigate the non-equilibrium dynamics of the symmetry-resolved R\'enyi
entropies in a one-dimensional gas of non-interacting spinless fermions by
means of quantum generalised hydrodynamics, which recently allowed to obtain
very accurate results for the total entanglement in inhomogeneous quench
settings. Although our discussion is valid for any quench setting accessible
with quantum generalised hydrodynamics, we focus on the case of a quantum gas
initially prepared in a bipartite fashion and subsequently let evolve unitarily
with a hopping Hamiltonian. For this system, we characterise the
symmetry-resolved R\'enyi entropies as function of time $t$ and of the
entangling position $x$ along the inhomogeneous profile. We observe an
asymptotic logarithmic growth of the charged moments at half system and an
asymptotic restoration of equipartition of entropy among symmetry sectors with
deviations which are proportional to the square of the inverse of the total
entropy.
