Autoleveller

Unless I am missing something, I don't see any way of using GRBL and leveling without using these separate operations.
1.In your levelor, you select and read in the target .nc file, you then write out a probing nc/grbl code (considering the xy extents),
2. Run the resulting gcode on your board ...

I have a similar request for reading a log of leveled data. The latest version of GRBL 0.9d now has a G38.2 straight probe instrruction that returns the X,Y,X of the probe point. (I have tested this). Output looks like this
>>> G38.2 Z10
[Probe:0.000,0.000,5.031]
With this we can now use GRBL ...