Hi Mohamad,
Thanks for contacting Syncfusion support.
We have already logged a feature request for your requirement “Support to change REST API parameter dynamically using Dashboard Parameter” and it can be tracked through our feedback portal below.
Please upvote this feature to make this our priority. While this feature itself is important we will prioritize the features every release, based on the user demands.
If you have any more specification/suggestions to the feature request you can add it as a comment in the portal.
Thanks,
Renuka N.