Yes. Although it is possible to create a rule with the merchandiser, you can only boost products.
To create the rule, you can use the Algolia Dashboard or send the rule to Algolia using one of our API clients.
See this guide on creating a rule condition with a filter, expanded on here.
Please ensure that the rules you create don't conflict with any existing rules you may have created in Magento. Also be aware that you shouldn't edit any rules in the Dashboard that may be overwritten by changes you make in Magento.