I would like to know if it's possible to change some default system value with a child theme.

For example, if I go to Configuration > Catalog > Product Review > Allow Guests to Write Reviews.

The default value seams to be Yes when the checkbox use system value is checked.

I would like to know if I can override the default value from a child theme using XML config file, so guest are not allowed to write reviews by default and should be enabled manually from configuration if needed (by unchecking use system value).

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