All of our SCIP indexers are open-source: scip-java (for Java, Kotlin and Scala), scip-typescript (for TypeScript and JavaScript), scip-python, scip-ruby, scip-go and scip-clang (for C and C++).
As my colleague mentioned in a sibling comment, we have an existing indexer lsif-clang which supports C++. I just added a Chromium example to the lsif-clang README right now: (direct link) https://sourcegraph.com/github.com/chromium/chromium@cab0660...
We are also actively working on a new SCIP indexer which should support features like cross-repo references in the future. https://github.com/sourcegraph/scip-clang
Right now, Abseil doesn't have precise code navigation because no one has uploaded an index for it. In an ideal world, we would automatically have precise indexes for all the C++ code on Sourcegraph, but that's a hard problem because of the large variety in build systems, build configurations, and system dependencies that are often specified outside the build system.