Here is the text of the case that matters. A 14th amendment question over ballot scrutiny is certainly on the table. Huge implication on states that loosened restrictions on absentees and/or implemented MIB.
https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.democracydocket.com/wp-content/uploads/sites/45/2020/11/Kelly-v.-Commonwealth-Final_Emergency-Application-for-Writ-of-Injunction.pdf&ved=2ahUKEwjcmu3HkbftAhVBmK0KHUSuCvEQFjAFegQIBxAB&usg=AOvVaw3za6Qgsnl9b7kNOUsGbWkp
https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.democracydocket.com/wp-content/uploads/sites/45/2020/11/Kelly-v.-Commonwealth-Final_Emergency-Application-for-Writ-of-Injunction.pdf&ved=2ahUKEwjcmu3HkbftAhVBmK0KHUSuCvEQFjAFegQIBxAB&usg=AOvVaw3za6Qgsnl9b7kNOUsGbWkp