OptimoRoute might be a bit more popular than Runtastic. We know about 1 link to it since March 2021 and only 1 link to Runtastic. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Workaround is to use SHealth only, export gpx file, then import it through runtastic.com (Profile (Arrow Next to profile picture) ->Settings->Activity Import). The imported workout count for the challenges. Source: over 1 year ago
Have you tried using an existing tool such as OptimoRoute? (no affiliation, I know the founders). Source: over 2 years ago
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