Single click calender day marking

I have an automation that has to run on particular days. Which days usually is decided 1 to 2 weeks on beforehand, but rarely is a predictable schedule like “every monday” or “every3 days”…

Ideally I am imagining a monthly calendar view/card/popup with just the number of days, and the possibility to click on each day the automation should run (highlighting that day, and if possible unhighlighting it with a second click). The automation would check the calendar every day and when clicked (highlighted) would start.

Has anyone seen or done something similar?

I have been trying things with calendars but all I found until now always involves clicking a date on a calendar, naming an event, selecting start/stop times or marking as whole day events… etc. Too complicated for the use case I have. I am looking for a single click, mouse only action