Yes, you can. Servebolt support the use of Composer on all our servers. We've made Composer 2 available on all of our servers. At the moment when you use composer, you still get Composer 1. If you want to use Composer 2, you can use composer2 as a command.
If you are still dependent on Composer 1, you should now use composer1 as Composer will be updated to use Composer 2 at a later date.