Logic has been landed in Chromium Try Flake to always report new flakes to FindIt: https://chromium-review.googlesource.com/c/infra/infra/+/1054699

However, it looks like FindIt is not ready to accept flake report without bug id yet: https://cs.chromium.org/chromium/infra/appengine/findit/findit_api.py?q=bug_id

Needs to adapt FindIt before deploy Chromium Try Flake.