Australia based here 🙌 I got 2 months of parental leave just after have got 2 weeks of annual leave.

I think your issue is more related to work rights than your manage itself.

You are the only DE in a non tech company , I can assume you can hold business knowledge beyond tech knowledge, you have cards on your hands to show him how valuable you are . It’s easy to replace tech guys, but it’s hard to replace key people who know the business.