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Thank you very much, appreciate your help.
Things are apparently a bit more complicated as on the persons (Android) smartphone the local (Huawei) calendar app was being synced with a (Huawei) tablet - via the google account - yet this "Phone"-calender does not show up in the google account when accessing it through a browser, and from the phone / tablet there's no option to export anything (without third party apps & faffing around).
Things like this is exactly why I am running back crying into the arms of the Apple ecosystem.
Maybe I'm just too old for this shit but I realised that it will take a lot less time and nerves if I just enter a hundred appointments by hand into the macOS calendar again and call it a day
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You can export the contents by clicking the three dots on next to the name of the calendar under 'My calendars' –> Settings and sharing –> Export calendar. Then you can import it into the Mac calendar and either copy and paste events into existing calendars, or merge by right clicking the newly-imported calendar in the sidebar and choosing one to merge into.