Unique visitors per Page URL?

I wonder, how/if i can get unique visitors per page URL per some period (week/month …)

The problem is, that according to Reporting API Reference: API Reference - Matomo Analytics (formerly Piwik Analytics) - Developer Docs - v3

there are:
entry_nb_uniq_visitors - Number of unique visitors that started their visit on this page
exit_nb_uniq_visitors - Number of unique visitors that ended their visit on this page
sum_daily_nb_uniq_visitors - Sum of daily unique visitors over days in the period. Piwik doesn’t process unique visitors across the full period.

But I need unique visitors per the selected visitors, not just those who started or exited on this page.
I guess it is not there, but that it could be done by some sql query and maybe cached ??? Can you point me to some help, so my programmer could do it as a plugin?