It seems that you may just need a "Start Here" course that contains course descriptions and links to the actual courses. In this "Start Here" course your home page might have a link or button for each option: Power BI, Jira, etc. that links internally to a Page that further describes that path. Somewhere on THAT Page you would place a link or button to "Enroll in This Path" which then links externally to a separate course (e.g. Power BI). Depending on how your system is set up, the courses with content might need to be set for self-enrollment.
I'm not good with visuals, but here's a try:
"Start Here" Canvas course - contains multiple Pages with course path descriptions
Power BI-1 Canvas course - contains content for the first course in this path, accessed from "Start Here" course
Power BI-2 Canvas course - contains content for the second course in this path, accessed from the last requirement in Power BI-1
Power BI-3 Canvas course - contains content for the third course in this path, accessed from the last requirement in Power BI-2
...and so on
Jira-1 Canvas course - same idea
Jira-2 Canvas course
etc.
If your "learning journeys" are short, and not full-fledged courses, you could just put each pathway into its own Module within one Course, with or without Requirements.
Power BI Module
Jira Module
Excel Module
How do I add a module?
How do I add requirements to a module?
You also could look at using Mastery Paths within one course if your institution has this feature enabled:
How do I use Mastery Paths in course modules?