Only task and subtask in a dead line ical

ical in the public access describe task from start to end. It is useful when you want to see all your stand by task at once. But sometimes, when you follow many project with lot of task, your calendar (for me Lightning in Thunderbird) can’t display a readable view.

Is possible to have in public access page of a project an ical option to subscribe to an ical file with only the dead line of task (and sub task) of the project?