Resource of type 'AWS::ElasticLoadBalancingV2::ListenerRule' with identifier 'Priority '1' is currently in use

Serverless Framework
1

There are so many Listener rules in my alb.My serverless’s alb priority is set up to 1.This priority has already existed in alb.So the error above occurs.

events:
      - alb:
          priority: 1

I want this priority without hard code.Is there a way to insert rule with priority automatically?And can I set up priority with variable instead of hard code.

2

Since I can order the priority manually,could you add a value of priority like top in the serverless?
It means when I insert a rule,I have the highest priority.If there is a first priority,it will follow the rule I insert.