Issue with attaching spotinst vmss to Application gateway load balancer

I have created 2 modules in terraform 1. Application Gateway load balancer 2.Spoinst elastic group creation.

I want to attach the scale set created in spotinst to the application gateway backend pool.

I believe below syntax is to attach AppGateway loadbalancer in spotinst elastic group creation. But i am having doubt on how to get the below values.
Spotinst module :
load_balancers {
type = “”
balancer_id = “”
target_set_id = “”
auto_weight = true
Can anyone pls guide me what is the value for the above syntax to attach azure application gateway loadbalancer to spotinst elastic group creation.