Hi Michael,
As mentioned earlier SfMap control does not have support to achieve your requirement ”Support to load KML files through the REST service”. So, we have logged a feature request for this, and it can be tracked through our feedback portal below.
Please cast your vote to make it count. We will prioritize the features every release based on the demands, and since we don’t have an immediate plan to implement this feature and it will be included in any of our upcoming releases.
If you have any more specifications/suggestions to the feature request, you can add it as a comment in the portal.
Regards,
Eswaran.