Is there any way in sonarcloud configuration to turn off this check
You can remove it from your quality profile. Note that it will remove all issues raised by this rule, including ones unrelated to optional chaining. I don’t see other alternative though.
Here is an example on how to do it:
In addition, I advise you to come back to the original profile once the issue is resolved, to benefit from the latest changes and additions (or regularly check for updates).