Is it possible for org-mode agenda view to display a customized label for the week, in addition to the week number included by default? For example, the agenda for the current week shows:
Week-agenda (W37): Monday 9 September 2019 W37
Instead, I would like it to show one of the following options, or a similar one (no preference, other than ease of implementation):
Week-agenda (W37 | A W00): Monday 9 September 2019 W37 | A W00
Week-agenda (W37): Monday 9 September 2019 W37 | A W00
Week-agenda (W37 | A W00): Monday 9 September 2019 W37
The custom label captures one of three periods in the year (A--C), each comprising 10 weeks (W00--W10). The start date for each period is arbitrary, so it has to be set manually.