Chartability is a kind of WCAG 2.1 extension dedicated to data visualization. From the site:

Chartability is a methodology for ensuring that data visualizations, systems, and interfaces are accessible. Chartability is organized into principles with testable criteria and focused on creating an outcome that is an inclusive data experience for people with disabilities.

It's basically an evaluation tool, so I guess anyone in the topic might want to audit chaarts following the distributed workbook.