Hi @Niklas_Benjamin_Muegge - Unfortunately the featuredProperties field currently only accepts the names of top-level properties, and there is no way to promote nested properties. The best workaround available at the moment is to change your schema to flatten out the set of properties, such that more are available at the top level. For example, create a market_price property instead of a nested market_data.price.
I think it would be nice if we supported nested properties in sync tables, and perhaps even other more complicated formulaic columns or even buttons. I’ll raise this with the team, but I wouldn’t expect to see a change here in the short term.