Hello @Stephanie Paavola
Welcome to the community.
Jira does not support adding the native scrum Velocity Report to Jira Dashboards. You can find third party apps in the Marketplace that would provide Velocity Report gadgets.
Welcome to the community :)
Just as Trudy pointed out, there are some interesting options for this in the Marketplace. Especially, I suggest you try Dashboard Hub for Jira - Reports & Charts, app that we develop.
Add the Scrum Velocity gadget to your dashboards with Dashboard Hub! This is how it looks:
Feel free to learn more about the Scrum Velocity gadget here!
Iván, Product Marketing Manager