Palette handling

Hi! Big thanx for amazing ext.

One question: How i can add custom 'palettes', like original TCA:

'palettes' => [
   'aPalette' => [
      'label' => 'LLL:EXT:myExt/Resources/Private/Language/locallang.xlf:aPaletteDescription',
      'showitem' => 'imagecols, image_zoom',
   ],
],

Something this:

->addCustomPalette('aPalette')
  ->addField('imagecols')
  ->addField('image_zoom')

• Creating new palettes
• Changing existing palettes
• Adding fields to palettes
• Changing fields inside palettes
• Removing fields from palettes