That is a great initiative! The users you have sent a message to will get an email notification about a new chat in CrowdWorks. Of course, it is up to the investors how they choose to proceed with your message.

I would emphasize that with investors, often quality is more worth than quantity. I suggest sharing updates/growth signals to the community feed since these are viewed and read by the investors. If they have seen your company posts before your message, they might be more interested to hear more.