Border radius on TextLayer background

[mariush2]

Target Use Case

Hi, I'm trying to get the background on tooltips of an EditableGeoJson layer to have rounded corners but can't seem to find a way without having to create a sub classed layer.

Would it be possible to add a new prop to the TextLayer that enabled users to set border-radius in a similar way to css?

The look I am after is this:

Proposal

getBorderRadius:

getBorderRadius: 5 // A number is just the same for all corners,
getBorderRadius: [5,2,5,2] // An array of numbers would work in the same way as other CSS shorthands.