Get "dependents" with specific version constraints

I would love for a possibility on packagist to get a list of packages which depend on a specific version constraint of a base package.

There is i.e. https://packagist.org/packages/typo3/cms-core/dependents?order_by=downloads - but that lists a few thousand packages. I would like to only see packages that are compatible with TYPO3 ^12.0.

Reason is I want to check for a specific code fragment in all public extensions for this project for research, and I somehow need to download&grep in all these packages.

As a fallback I could use a filter option on https://packagist.org/search.json?type=typo3-cms-extension&per_page=100 with version constraints?

(I tried for a few hours to research existing issues and stackoverflow, didn't really find anything. I'm sorry if there is a duplicate issue on this)

Start with the existing dependents page at packagist.org/packages/typo3/cms-core/dependents and the search.json endpoint mentioned in the issue. Trace how dependent packages and version constraints are represented, then determine where a ^12.0 filter would fit. Done means the result contains only packages compatible with the requested constraint.

Written by the indexing model from the issue text.