How to Set Specific Upstream DNS Servers that Unbound Uses

To answer your initial question, yes Unbound can do what you asked but would normally not be desired.
To do so, create a new config file eg:

sudo nano /etc/unbound/unbound.conf.d/forwarders.conf

With below content:

forward-zone:
        name: "."
        forward-addr: 8.8.8.8
        forward-addr: 8.8.4.4

And restart:

sudo service unbound restart

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