I get to hear that question more frequently these days - very interesting!
Your findings are correct: This functionality is currently not implemented. But I see the value of it and will consider it as an feature to add in the future.
In the meantime, you can get there with a little workaround and an undocumented feature.
If you make a logicblock "evaluate" call and add .json at the end of the URL, you will get the result in JSON. So if you create a logicblock with just one boolean variable connected, you can actually read out that value with this trick.