Authors CurseForge

After my pull requests to amend another author's addon have not gotten any reaction, I am now trying to publish my modifications as a plugin.

One change I want to make is to change the description of one particular AceConfig-3.0 Options Tables entry:

Code of the original addon:

local optionsTable = {
  type = 'group',
  args = {
    someSlider= {
          type = 'range',
          name = "Some Slider",
          desc = "Description to be improved.",
          min = -10,
          max = 10,
          step = 1,
    },
  },
}

LibStub("AceConfigRegistry-3.0"):RegisterOptionsTable("otherAddon", optionsTable)
otherAddon.optionsMenu = LibStub("AceConfigDialog-3.0"):AddToBlizOptions("otherAddon", "otherAddon")

What I want to do is to change the description of the slider. I am able to access otherAddon.optionsMenu from my plugin. But how can I make that particular change?

Thanks for any advise!