If you have a scene you like, you can create a virtual switch and have that switch coming on trigger the Lutron scene through the Lutron IFTTT channel. That may introduce some additional lag, so it might work for some use cases but not others.
Once you create a virtual switch, it will show up on the list of your switches in SmartThings, so you can use it in a routine or the official SmartLighting feature.
Alternatively, you should be able to use webcore and set the different switches at different dim levels. I think that will work with Lutron. (@ady624 would know). Setup is more complex, but there are lots of community members who will be glad to help you, and it gives you a lot more options.
FAQ: What is WebCoRE? (And what was CoRE?)
The third alternative is to create one automation for each dimmer, using the same trigger condition for each, which is annoying but will work.