How can I track my distance and speed using workout app during roller scaring?

Greetings, Joshlik!
Thanks for reaching out the Apple Support Communities! That is a great question you have about tracking your workout when roller skating and I’m happy to assist! I suggest checking out this article About workout types for the Apple Watch. Specifically, try the steps listed in the Other section:

Other

Choose Other when you can't find a matching workout type. When you use Other, you earn the calorie or kilojoule equivalent of a brisk walk anytime sensor readings are unavailable.

At the end of an Other workout, you'll get the option to name your workout. This can help categorize different types of activity, like yoga or dance.

Sounds like you need to look for a third party app in the App Store to do what you're wanting.

I found this...

iSkate - GPS skating computer for inline and roller skates on the App Store

Not sure I would agree that it is very popular but tell Apple you would like to have it included as an activity: Feedback - Apple Watch - Apple

That would be information Apple would not release prior to implementation.