Igst credit for imports

We have down loaded the auto uploaded draft copy of annual return GSTR 9 for 2017 -18 , which has to filed before end of June 19 . We are importers and have been claiming ITC for IGST part of the custom duty paid. But this is not auto uploaded in draft of GSTR9.  ITCs of other purchases are there under entry " ITC as per GSTR2A". IGST paid to customs department will not appear in GSTR2A. Please help us how to substantiate our claim of ITC on IGST paid to Customs.