>>stavro+mb
It looks like it doesn't. You might find alternative solutions like this user here*, but there is no guarantee any of it to work indefinitely on GrapheneOS. It's essentially a modified aftermarket firmware, and so, many security related features don't work out of the box, for example, the SafetyNet that many banking apps need.
*: https://www.reddit.com/r/GrapheneOS/comments/1jujvee/finally...