I saw there is a similar subject on How to update metadescription and meta title on shopify BLOG with Update a Metafield” module. However, the answer is not complete on the community discussion. I contacted shopify as you suggest, but they are not specialist about make.com.
Could you help please and tell us what do we have to write in the module shopify Update Metafield :
Metafield ID?
Value ?
Value type ?
Owner ressource ?
Owner ID ?
Description ?
Thank you for your help