We generally compress braced initializer expressions down to just to braces for brevity, since the normal case was that you used braced initializers only for initializing large arrays, so you generally did not want such a huge verbose string of values. I know that's old-school thinking, and the new mantra is to use universal brace initializers everywhere. But, there is a lot of old-school code out there.
I will put in a feature request to add a separate tagging flag for "constexpr" vs "const", that will make it possible for us to show the tool top correctly, and also look into why "static" isn't showing up. It may be that we are omitting that just for brevity also, the concern being for the type of the symbol more than it's scope.
If you initialized it without the unnecessary braces, you would be able to see the value.
static constexpr auto days_in_feb = 28;