How add a new Google attribute ?

Hello,

There are only 15 Google attributes, and most of Google attributes are missing, please check at https://prnt.sc/KxEzb8wFgMa9

We need other Google attributes, like Capacity, sale_price_effective_date, custom_label, here are

https://support.google.com/merchants/answer/6324460?hl=en

https://support.google.com/merchants/answer/6324473?hl=en&ref_topic=6324338&sjid=13615339807214477751-NA

https://support.google.com/manufacturers/answer/7495963?hl=en#:~:text=The%20capacity%20%5Bcapacity%5D%20attribute%20defines,1TB%20and%202TB%20storage%20sizes

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I went through your official article at https://woocommerce.com/document/google-listings-and-ads/attribute-mapping-use-cases/#mapping-custom-fields

and there is a code snippet for Mapping Custom Fields:

add_filter(
		'woocommerce_gla_attribute_mapping_sources_custom_attributes',
		function( $values ) {
			return array_merge( $values, ['isbn']);
		}
	);

Unfortunately, the above code snippet is only used for Mapping Custom Fields to the exist 15 Google attributes, but not for creating a new Google attributes, so, is there a code snippet to create new a Google Attribute, like Capacity, Custom label, sale_price_effective_date ?

Thanks