Letting Embedded Boundary work with AMRcore model mainly in Fortran interface

[paradoxknight1]

Dear community,

I'm currently working with the fortran interface amrcore model. And there is a requirement of implement the Embedded Boundary function.
Based on the docuemnt, it seems that to build a Embedded Boundary, the Geometry object is needed. However, through the usage of amrcore model, the geom, BoxArrays, and DistributionMapping are both automatically building through the C++ part of the AMRmesh model.
The thing I would like to ask is that if it is possible to build the embedded boundary in the Fortran's inherit virtual functions.

What's more, as it mentioned in #3645.
"Usually one calls EB2:Build with the Geometry at the max level at the beginning." What exactly is the max level? As the Geometry in Amrcore is build automatically.
Is it possible to build a geometry seperately aginest the Amrcore framework?

Many thanks.