Choose a list, click edit, tap the 3dots button on the right, select Import
or Import (CSV)
Format (The first line will be ignored):
TodoGroup; TodoName; pictureNeeded
ExampleGroup1; ExampleTodo1; 0
ExampleGroup1; ExampleTodo2; 1
ExampleGroup2; ExampleTodo1; 1
ExampleGroup1; ExampleTodo1; 1
To simply generate such CSV files you can create an Excel Spreadsheet, click Files > Save As
and select
CSV UTF-8 (comma delimited) (*.csv)
as fileformat.