Make it possible to generate charts based on available data

[niciki]

Hi! It would be very cool if it were possible to generate such diagrams not only by entering a nickname from github, but also by directly transmitting data through the entered text or file. This would allow, for example, to make similar graphs for other git platforms without implementing their api.
For example, something like this:

{
  "2022-10-03": 3,
  "2022-10-05": 16,
  "2022-10-07": 2,
  "2022-10-10": 1,
  "2022-10-11": 2,
  "2022-10-12": 3,
  "2022-10-13": 1
}

#145
#125