Stats Pie Graph with Distinct 'Learning' and/or 'Relearning' Sections

An Anki addon to change the pie chart colors in the stats overview window.
The stock version of Anki includes a pie chart at the end of the statistics overview screen, with the deck/collection divided into 'New', 'Suspended+Buried', 'Young+Learning', and 'Mature' sections.
Since I use longer intervals while 'learning' compared to the default options, I've felt it may be better to separate 'Young' and 'Learning' cards. However, vanilla Anki doesn't include this option, so I figured I'd make one!
Notably, as of v1.1, this addon is compatible with both v1 and v2 review scheduler versions!
Development
Version history
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v1.1: Adapted piegraphs.py functions (and created config.md and config.json) to allow user configuration via the addons manager. Compatible with both v1 and v2 scheduler versions.
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v1.0.1: minor formatting updates
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v1.0: initial release
Examples
Native divisions/colors:

Graph with 'learning' cards option enabled (alone):

Graph with 'relearning' cards option enabled (alone):

Graph with both 'learning' and 'relearning' card options enabled:

Installation
Via the Addon Manager
The addon number for install via the in-program app is 1828603731. To see the addon page, visit here.
Manual Installation
Create a folder in your respective addons folder (or clone this one), so that it contains __init__.py and piegraphs.py.
Do not put these in a subfolder; i.e., it should be .../addons_folder/newFolder/files.py. The meta.json file should be created automatically by Anki after loading for the first time after install.
Conflicts with other addons: The only ones I imagine are those that also modify the native cardGraph or _cards function of anki/stats.py, declared as anki.stats.Collection.cardGraph or anki.stats.Collection._cards. There was a previous conflict with Progress Graphs and Stats for Learned and Matured Cards, but this resolved with some debugging of the function wraps used here.