There is no link to this feature in the documentation or in the official AWS support forums for Lightsail or EC2.
Lightsail does not disclose any of the basic resources that it allocates to you in its native services (EC2, EBS, Route 53, etc.), therefore it seems a reasonable premise that (at least on this spelling) it is not available .
You can, of course, establish network connections from Lightsail to other AWS services (such as RDS or EC2 instances) with VPC peering .
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