Need to set calendar to ISO weeks but with the week starting on Sunday and week 1 containing Jan 4

[amakaa]

Is your feature request related to a problem? Please describe.
I'm trying to set the calendar to ISO weeks but with the week starting on Sunday and week 1 containing Jan 4

Describe the solution you'd like
Setting the locale should be enough but it turns out that Week 1 in Jan 2026 doesn't have Jan 4

Describe alternatives you've considered
I tried formatWeeks method but it seems difficult to implement

Additional context
On material UI datepicker, setting the locale as { weekStartsOn: 0, firstWeekContainsDate: 4 } works to have Jan 4 in week 1 and OK with having a week 53 to maintain the rule:

In react-datepicker it forces it to stop at week 52: