Maya does support importing point clouds from Alembic, but unfortunately there is a bug where it only works if the point cloud follows Maya's naming conventions, i.e. the point cloud needs to be at /particle1/particleShape1 in the Alembic archive (/particle1 needs to be an Alembic IXform and /particle1/particleShape1 needs to be an IPoints).

That said, Maya does not currently (as of Maya 2022) support animated point clouds or curves in Alembic. The workaround is to use the Bifrost plugin that ships with Maya.