BPM, Workflow, and Case

We have a rest API that will be consumed in v8.5.7 and we would like to create a swagger file so the same will be consumed without having to write the javascript code. Looking for documentation on how to accomplish this - thanks.

I'm not sure you asking how to create swagger files in general or not. but I personally use swagger editor and apibuilder to create the swagger files. have a look at them:
swagger editor: https://editor.swagger.io/

apiBuilder: https://apibldr.com/

Hello and thanks for responding, Amr. I should have been more specific - the goal is converting available Rest API into Swagger yaml format. I've seen samples of writing new rest API & then going in to convert them to YAML, but can't seem to find the way of generating REST documentation for existing IBM BPM rest API. Right now I'm looking for the way of generating the yaml.