I am writing a document in which I will input the PDF of some of my papers. In the introduction, I would like to refer to them in this way
(Joce et al, 2019, included page XX).
I can of course do this by defining a specific cite call for those papers:
\newcommand{\citeinc}[1]{\cite[][included page \pageref{ref:#1}]{#1}}
but this requires to use a different cite command for my papers and those of others, meaning I need to check that I always do so in text I reuse from previous documents, and more importantly that I can't do such things e.g.
\cite{Other12,Joce13,YAOne14}
(Other et al, 2012, Joce et al, 2013, included page 101, One et al., 2014)
Given the high level of customization offered by biber, I wonder whether it would be possible to auto-append this text to my reference label (but it shoudn't show in the reference list, although... that'd be acceptable I guess).

\pagerefcall within it? And optionally, print this added text only in labels, not in ref list. – Joce Mar 09 '20 at 19:38