Add some extra field to category admin page by plugin

$viewObj->fields['namekey_of_field'] = (object)  [
				'field_id' => '',
				'field_table' => 'category',
				'field_realname' => '',
				'field_namekey' => '',
				'field_type' => 'text',
				'field_value' => '',
				'field_published' => 1,
				'field_ordering' => 1,
				'field_options' => [
					'errormessage' => '',
					'regex' => '',
					'attribute' => '',
					'placeholder' => '',
					'inline' => '0',
					'target_blank' => '1',
					'allow_add' => '0',
					'cols' => '',
					'filtering' => '1',
					'maxlength' => '0',
					'rows' => '',
					'zone_type' => 'country',
					'pleaseselect' => '0',
					'size' => '',
					'format' => '%Y-%m-%d',
					'allow' => '',
					'allowed_extensions' => '',
					'upload_dir' => '',
					'max_filesize' => '0',
					'max_width' => '0',
					'max_height' => '0',
					'multiple' => '0',
					'readonly' => '0',
					'mysql_query' => '',
					'datepicker_options' => [
						'today' => '0',
						'inline' => '0',
						'monday_first' => '0',
						'change_month' => '0',
						'change_year' => '0',
						'year_range_start' => '',
						'year_range_end' => '',
						'show_btn_panel' => '0',
						'show_months' => '1',
						'other_month' => '0',
						'exclude_days_format' => 'mdY',
						'waiting' => '',
						'hour_extra_day' => '',
						'check_dates' => 'all'
					]
				],
				'field_core' => 0,
				'field_required' => 0,
				'field_default' => '',
				'field_access' => 'all',
				'field_categories' => 'all',
				'field_with_sub_categories' => 0,
				'field_products' => '',
				'field_address_type' => '',
				'field_frontcomp' => 0,
				'field_backend' => 1,
				'field_backend_listing' => 0,
				'field_display' => null,
				'field_shipping_id' => '',
				'field_payment_id' => '',
				'guest_mode' => true,
				'field_url' => str_replace('/', '\/', JURI::base()) . '/administrator\/index.php?option=com_hikashop&ctrl=field&task=state&tmpl=component&'
			];