No. TrueNAS is a NAS platform, and expects you to store your files locally on the NAS. You can use something like NextCloud to store files in a fashion similar to Google Drive, locally, and then other apps could potentially access that data. However, what you are asking for requires the ability to install random software packages (for Google or whatever your cloud storage of choice might be) and that is not within the scope. You might want to install a generic FreeBSD or Linux server to accomplish your goal, or perhaps a virtual machine.