In my oomponent, I have an array of array :
weekDays: Array<Array<{title:string, value:number, isChecked:boolean}>>;
The JSON structure of weekDays look like this :
How to access to (for example) the third value of isChecked of the the second array contained in weekDays ( weekDays1 ), IN my HTML template.

weekDays[1][2].isChecked