Google has been porting Blink to iOS and making steady progress. Here's the tracking bug on Chromium's bugtracker: https://issues.chromium.org/issues/40254930

Presumably they would have invested more resources into it and been done by now, if there was a viable path to release, which there isn't yet due to Apple's EU geofencing, and because there were a number of bugs and limitations in Apple's BrowserEngineKit which browsers are forced to use.