If you have a school age child, then you do whatever the working parents in your school do. Or if every family has a SAHP, you ask them for a favour, or if everyone else has a granny that does it, you ask them for a favour.
If you live in a place where your child is the only pupil, then I understand. If you don't know/get on with any of the other parents where you live, you have bigger problems that jury service.
Most people would help out. Usually, you'd be back for school pick up anyway, so it would be asking your school age DC's friends to have them before school. If your DC have no friends, that's a whole different issue...
Pre-school kids can go in their usual care, or care near the court.
If you start from 'how do I get out of this', then you'll think one way. If you start from 'I have to do this, how do I sort the childcare problem', then you'll find a way.
Courts are near multiple childcare providers that will be perfectly adequate for NT children for 4 hours per day for 2 weeks. Get a grip.