CycleStreets, Kamoot, OpenCycleMap, but possibly not Google.
Google are trying (?) to improve things in London https://www.bloomberg.com/news/articles/2023-12-29/google-goog-maps-for-cyclists-transport-for-london-tfl-to-boost-service?srnd=premium-uk
At least TfL» (Transport for London - about) has some infra, not sure how successful in other places.
The experts acknowledge it is not easy, but the London Cycling Campaign gives Google cycle routing a firm thumbs down.