How to use calendar format to enter numeric data in Shiny?

Question

Is there a way to use the calendar input layout (ala dateInput() ) for non-date data?

In particular, I want to be able to open the calendar view, but instead of dates, I need to select a grid of possible input values.

The resulting graphic object, if possible, will open as follows:

(Note: # are arbitrary and random in the above image)

I looked at the code for dateInput , but it was not immediately clear how I would start converting the code to use input values ​​instead of dates ...