Disable Notification Vibration for Specific Apps
Via https://www.xda-developers.com/stop-vibrations-android-apps/ :

Vibration can be disabled per-app with an adb command:

adb shell
cmd appops set [package] VIBRATE ignore


The [package] is usually something like "com.somecompany.someappname". There are a various programs that will let you see the name of apps (the page there suggests one), but

adb shell 'pm list packages -f'


should do it as well.

More detailed info about installing and using adb is listed at the top link or in other answers on SE.