Customize title hl group background

Is there any way to set custom highlight groups for the different titles ("ChatGPT", "Prompt", "System", etc.)? I'm trying to configure the windows to match my telescope theme exactly, and this is the last hurdle in the way. Thanks.

opts = {
  popup_window = {
    border = {
      highlight = "TelescopePreviewBorder",
    },
    win_options = {
      winhighlight = "Normal:TelescopePreviewNormal,FloatBorder:FloatBorder",
    },
  },
  system_window = {
    border = {
      highlight = "TelescopePromptBorder",
    },
    win_options = {
      winhighlight = "Normal:TelescopePromptNormal,FloatBorder:FloatBorder",
    },
  },
  popup_input = {
    border = {
      highlight = "TelescopePromptBorder",
    },
    win_options = {
      winhighlight = "Normal:TelescopePromptNormal,FloatBorder:FloatBorder",
    },
  },
  settings_window = {
    win_options = {
      winhighlight = "Normal:TelescopePromptNormal,FloatBorder:FloatBorder",
    },
  },
},