Specifying plugin version via helm chart list

running Grafana 7.5.5 on Ubuntu 20.04, I am trying to figure out how to specify a beta version of a plugin via helm chart; I know it can be done via the cli, but I want to deploy automatically to my k8s cluster using a specific beta version without having to change anything via cli every time I deploy.
I currently pull in my list of plugins using the following syntax in helm:

  - plugin1
  - plugin2

I’ve searched high and low for a way to specify a version when deploying with plugins in this manner, but to no avail.