Is upgrading a release installed from local chart files supported?

[lwabish]

I am trying to upgrade some values in a helm release installed before by this command: helm upgrade -i --create-namespace -n foo barRelease ./chart

I tried UpgradeChart method in this package, but it seems that a chart name like repo/chart which represents a chart in some repo has to be provided.
I read some code of this method and find it invoked GetChart method indeed.

So I wonder If I am using this package the right way and if this package supports my case of upgrading release values of local charts?

[zvonkok]

/cc @zvonkok