PointCoordinate returns a string so you’ll have to cast it to a float first, round it, and then format it to show 2 decimals places. This should work, assuming only 1 axis.
I added the “Block” trick during a service release of v8. There’s currently no UI for it, but if you create a Point Coordinate object and then replace the object ID with the word Block and then convert the text into a block instance the text field parser will return the blocks transformed location. I hope to get the UI in place for v9. https://mcneel.myjetbrains.com/youtrack/issue/RH-68819
i think this trick could be extended into proper function. it is very useful. i can think of returning volume for solids inside block, areas of closed curve inside block etc.
Rhino 7 introduced Python parsing of TextFields as Japhy posted above. There are several ways to lightly extend the returned results based on your needs. Most Math and String functions are supported, but more advanced python execution is ignored. eg no virus potential in a textfield.