retrieve an app's custom config in javascript?

Is it possible to retrieve the current app's configuration via javascript in my application.js? I don't see it in the /config endpoint or the output of Splunk.util.getConfigValue().

Edit

I mean the custom config handler that is pointed to by my restmap.conf

restmap.conf
[admin_external:myapp]
handlertype = python
handlerfile = AppConfig.py
handleractions = list, edit

class AppConfig(admin.MConfigHandler):
  def setup(self):
    configArgs = []
    scalarArgs = []
    joinArgs = []

    if self.requestedAction == admin.ACTION_EDIT:
        scalarArgs = ['hostname','port','username','password']
        ...

And the subsequent handleEdit method

  def handleEdit(self, confInfo):
    name = self.callerArgs.id
    args = self.callerArgs

    ...

    self.writeConf('myapp', 'appliance', self.callerArgs.data)

I'm interested in retrieving the values from the myapp.conf file that is created/updated by the self.writeConf above.

  myapp.conf
  [appliance]
  key1 = val1
  key2 = val2
  key3 = val3