Dynamically set screen title on load

How would I use the StackNavigationOptions set block to change the screen title ? do i need to just make a generic json string with the properties i’d like to set? like this… {“title”: “my screen title”}

You can dynamically change only those properties for which there are blocks. If the block for changing the title exists, you can change the title. If there is no such block, then it is impossible.