Generating test documentation HTML/PDF from an RSPEC test

We have created an integration/acceptance test framework based on the RSpec. We are creating integration test for automotive ECU software using RSpec DSL. I am looking for a tool that is capable to generate a documentation (HTML/ODF) out of the RSpec tests so I can provide it as a test specification to our customer (no they are not sattisfied with the source code)

I was looking into DOX, Swagger, rspec_api_documentation, fdoc. But they are all Rails specific. Our test are ruby non-web application and the DSL is based on the RSPEC one and the exceptions. I am looking for an output something like https://relishapp.com/rspec. So that the test describes the behaviour of Also I want to define some metadata which shold be the part of the output html.

Any help highly apretiated.