I tend to reach for Sonar when this comes up, but I'd take a look at all the options - most of them, to be fair, are separate tools that integrate with Bitbucket to feed data back into it, rather than apps in Bitbucket itself.
Have a look at https://marketplace.atlassian.com/search?query=coverage
I am sorry, I am out of my depth here.
I am old, and have moved away from my older needs to work with code coverage tools. My experience is mostly with Emma and Clover, and it's old experience.
My more recent exposure is little more than "focus on your test tooling, not coverage, one of the thing your testing should do is reporting back what it can and cannot test (i.e. coverage should be built in)"
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