Openroad doesn’t keep track of scan chain configurations in the ODB.

Once a scan chain has been backed in, nothing tells you a scan chain has been inserted.

One way of checking available scan chains is though the def files.

set def_file [make_result_file tes.out.def]
write_def $def_file

To know if a scan chain is present, check for the presence of the SCANCHAINS lable, eg :

SCANCHAINS 1 ;