how to get the mask annotations?

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in https://github.com/spmallick/learnopencv/tree/master/FaceMaskOverlay: may i ask how to get the csv data of annotations for mask images? such as: 3m.csv, anti_covid.csv, ...

• use what tool? can you share the script? (for mask point annotation and csv file generation...)
• why did't we annotate more points such as points inside the mask area but only annotated the points located on mask edge instead?