[chimerax-users] PDB coordinates missing--how to add residues to N-terminus

The first few N-terminus residues of a seq are grayed out in the PDB sequence viewer and are missing in the PDB chain. It is even possible for ChimeraX to make the peptide bonds to glue on the missing residues in the helix in accurate XYZ positions tacked on at N-terminus without resorting to generating an Alphafold model? I am also thinking ISOLDE won't work.