[Kwant] honycomb lattice with hole

Dear all, I’m new in kwant and I want to use this package to calculate transport properties of some graphene-liked materials with multi orbital per atom. In order to define hopping in the form of matrix, we need to determine the relative coordinate of neighbor sites. If we build the system using latt = kwant.lattice.honeycomb Could anyone help me to show how can I make a hole on the center of main region and leadS (I would like to make a graphene nanoribbon which have holes)?like in attached fiqure. Please find attached file. Best, Nafise