SEMrush and Ahrefs charge 100 dollars a month to tell you which SERP features your target queries trigger. This fires the queries at DuckDuckGo and Bing, detects 12 feature types, and shows which ones are big opportunities - free, no account.
Read the story behind this tool: Why I built this - target SERP features your queries already trigger.
Related: SERP Cohort Audit / SERP Snippet Preview