Thank you for contacting DreamHost support.
Unfortunately it is not on the VPS by default. You could install it
yourself, however, when doing some research on my end, it looks like it
may require "sudo" or root access to your Domain, which is not something
that we provide.
If you had to have this extension and it did require root access, you
could sign up for DreamCompute in your panel: Cloud -> DreamCompute. For
more information on DreamCompute, you may find the following article
Please do not hesitate to contact us if you have any questions or
anything else we can assist you with.
Have a great day,