Maybe use this library for that - https://frappe.io/charts what do you think? Or maybe it is possible to build a chart without libraries  Frappe chart 'A Month-wise Heatmap' <img width="917" alt="image" src="https://user-images.githubusercontent.com/3828802/106909677-91041180-6711-11eb-842d-085f46067056.png">
Maybe use this library for that - https://frappe.io/charts what do you think?
Or maybe it is possible to build a chart without libraries
Frappe chart 'A Month-wise Heatmap'