Yes, it is supported.

For more information, please refer to the "Implementing Designs" section of the Libero SoC Design Flow User Guide.

Quote "Notes: Libero uses multiple cores automatically. For this reason, Libero does not provide options
for setting multi-cores manually.”

Scroll down the Libero SoC Design Suite page and open the User Guides tab.
Access the Libero SoC user guides for each version.
https://www.microchip.com/en-us/products/fpgas-and-plds/fpga-and-soc-design-tools/fpga/libero-software-later-versions