No. On the GT-1000 and GT-1000CORE, the onboard looper functions (PLAY, STOP, and CLEAR) cannot be controlled via incoming MIDI CC messages from a DAW or MIDI controller.
For a full list of supported MIDI messages, refer to the GT-1000/GT-1000CORE MIDI Implementation: https://www.boss.info/global/support/by_product/gt-1000/owners_manuals/