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I have similar situation and have used this answer Send data from Lightning Web Component (LWC) to a Visualforce page from @salesforce-sas which worked perfectly for me.

Now I have the problem in the other direction - that is sending data through an event from VF Page -> Aura App -> LWC.

I see some ideas on this but nothing that solves this specific issue. Any help would be appreciated.

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You can now use Lightning Message Service for communication across VF page, lightning and LWC.

Try with example mentioned in release notes

https://releasenotes.docs.salesforce.com/en-us/winter20/release-notes/rn_lc_message_channel.htm

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