(22-Aug-2022 updated) The hints from git blame are also available in the latest IntelliJ IDEA.
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(For CodeLens function references feature) Now it’s a built-in feature after version IntelliJ IDEA 2020.1.
You can enable it from:
Ref: https://blog.jetbrains.com/idea/2020/03/intellij-idea-2020-1-beta2/