How to send data to an ec2 remote control?

Hello, I am contacting you since I need help.

I want to monitor several ec2s with grafana, it turns out that I have grafana installed from docker on an ec2 from another account. and the ec2 that I want to monitor is in another account, that is, two different AWS accounts.
In the account where I have docker with grafana I also have a container for Prometheus installed, now what’s up.
It turns out that the ec2 that I want to monitor has a private IP and receives requests only through a network type balancer.
So I want to know if there is any configuration to be able to export my data to grafana without the need to open ports and create target groups.

At the moment using node_exporter on port 9100 and opening the port in the security group and in the load balancer, create a target group, that’s how it works for me, but it seems to me that it is not so practical. Maybe there is a way to send my node_exporter data to my prometheus and then use it in my grafana that is in the container