Supply to sez

Yes you can apply for LUT online on portal.

As per Circular 40/14/2018

“c) Form for LUT: The registered person (exporters) shall fill and submit FORM
GST RFD-11 on the common portal. An LUT shall be deemed to be accepted as
soon as an acknowledgement for the same, bearing the Application Reference
Number (ARN), is generated online.
d) Documents for LUT: No document needs to be physically submitted to the
jurisdictional office for acceptance of LUT.