  The recently suggested quasi-local spin-angular momentum expressions, based
on the Bramson superpotential and on the holomorphic or anti-holomorphic spinor
fields, are calculated for large spheres near the future null infinity of
asymptotically flat Einsten-Maxwell spacetimes. It is shown that although the
expression based on the anti-holomorphic spinors is finite and unambiguously
defined only in the center-of-mass frame (i.e. it diverges in general), the
corresponding Pauli-Lubanski spin is always finite, free of ambiguities, and is
built only from the gravitational data. Thus it defines a gravitational spin
expression at the future null infinity. The construction based on the
holomorphic spinors diverges in presence of outgoing gravitational radiation.
For stationary spacetimes both constructions reduce to the `standard'
expression.
