We checked script, it is only possible to change schema from Product to Book but you cannot define other schema properties in form of itemprop via custom fields (ex: ISBN, bookFormat, inLanguage, publisher etc.. ). This is due current method of storing custom field definitions in Classibase.
If you just want to change from Product to Book then in your theme files search for Schema::SC_PRODUCT and replace it with itemscope itemtype="http://schema.org/Book".
Also remember to duplicate your theme folder before making changes in order to avoid loosing changes on theme update.
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