Flutter component library

Create a datepicker like scheduler list. Each row in the list is day card with Day, week, event1 & it's time, event2 & it's time. We have maximum 4 events in a day. Most of the cases it's 2. While we scroll the day of each month from first day, the month should place on top as sticky. While we reach December 31, the year should change and scroll that to top as sticky before month. We can press to select the day and show a check box for it's selection. Like that we can select multiple days. (Refer Gmail mobile app). We can place year filter, month filter and also event filter in top of the sticky year and month rows. (Self explanatory image shared). The events and its color should be read from json file. You can suggest simplest json format for it. Please don't use any commercial plugins or other third party plugins for it.