GST on Ocean Freight

Yes...
Corrigendum to IGST Not No.8/2017, specifies that wherever the taxable value is not available i.e when Freight amount is not known to the Importer, then 10% of the CIF value of Invoice should be taken as Taxable value. The GST payable will be @ 5% on 10% of CIF value or @ 0.5% on CIF value of Goods.