What problem does this address?

Currently, it is not possible to add templates for a single post with a specific taxonomy/term in the Site Editor.

What is your proposed solution?

This is a request for making this option available under Templates > Single Item: {post_type}:

On WooCommerce Blocks, we have been exploring different approaches for allowing store owners to add custom templates to individual products depending on their type (simple, grouped, variable, external, etc.). In a nutshell, these are terms of the product_type taxonomy. Ideally, we would like to rely on a more robust long-term solution provided by Gutenberg to achieve this goal: we believe this approach can benefit not only Woo, but basically anyone who intends to have a special template for a single post type given its taxonomy.