Better Treemap visualisation (label, shape)

Would it be possible to improve the Treemap visualisation to avoid the unreadable text labels in this visualisation?

It could also be possible to switch to other type of shapes (like circles or voronoïds) in this kind of visualistion. Great looking treemaps can be found on this site: https://www.treemap.com/

Treemaps are extremely usefull when looking at hierarchical data type (if empty values are taken into account in a nice way).

If the display of a structure or text in a readable maner coud be done in the treemap, that would be awsome.

The "(Empty)" label is awfull..; this should be configurable to display something else or not to display it.

Also the dots when a value canot be displayed fully is not great (better nothing).