It looks like it’s going to be enabled in Chrome from the next version (122).
https://support.google.com/chrome/a/answer/7679408#upChromeBrsrE121
- V8 security setting
Add a setting on chrome://settings/security to disable the V8 JIT optimizers, in order to reduce the attack surface of Chrome. This behavior continues to be controlled by the DefaultJavaScriptJitSetting enterprise policy, and the associated JavaScriptJitAllowedForSites and JavaScriptJitBlockedForSites policies. The setting is integrated into Site Settings. The setting rolls out in Chrome 122. The enterprise policies have been available since Chrome 93.
- Chrome 122 on ChromeOS, LaCrOS, Linux, MacOS, Windows, Fuchsia
I presume this setting will be added to Chromium at the same time, but don’t know for sure.
However, really it needs a WebAssembly Interpreter implemented (like DrumBrake in Microsoft Edge) to allow websites using WebAssembly to still function with JIT disabled (including Brave’s own captcha for example).