Theme extension to hide pinned tabs borders and dividers

Default brave theme doesn’t have borders around pinned tabs and it doesnt have separators:

Custom themes do have borders around pinned tabs:

I wonder if it is somehow possible to hide the borders for custom themes.
the only field that I figured out change the color of the border is toolbar_button_icon in the manifest.json under theme.color, but it also changes the colors of all icons in the toolbar so setting it to transparent value won’t do the trick…
I understand that there might be the limitation of the extension manifest and how much it allows to change, but am not sure if it’s the case here.

Thanks in advance!

Here is entire manifest.json of the theme

manifest.json
{
  "manifest_version": 3,
  "name": "Catppuccin Chrome Theme - Mocha Red",
  "description": "Soothing pastel theme for Google Chrome - Catppuccin Mocha",
  "version": "4.1",
  "icons": {
    "16": "images/icon16.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "theme": {
    "colors": {
      "frame": [17, 17, 27],
      "frame_inactive": [17, 17, 27],
      "frame_incognito": [69, 71, 90],
      "frame_incognito_inactive": [69, 71, 90],

      "toolbar": [30, 30, 46],

      "tab_text": [205, 214, 244],
      "tab_background_text": [108, 112, 134],
      "tab_background_text_inactive": [69, 71, 90],
      "tab_background_text_incognito": [205, 214, 244],
      "tab_background_text_incognito_inactive": [108, 112, 134],

      "bookmark_text": [205, 214, 244],

      "ntp_background": [17, 17, 27],
      "ntp_link": [243, 139, 168],
      "ntp_text": [205, 214, 244],

      "button_background": [17, 17, 27],
      "toolbar_button_icon": [243, 139, 168],
      "omnibox_text": [243, 139, 168],
      "omnibox_background": [17, 17, 27]
    },
  }
}
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