Registering method in custom SecurityExpressionOperations as Spring SpEL function

I have the following implementation of MethodSecurityExpressionOperations

public class CustomMethodSecurityExpressionRoot extends SecurityExpressionRoot implements MethodSecurityExpressionOperations {
        private Object filterObject;
        private Object returnObject;

        CustomMethodSecurityExpressionRoot(Authentication authentication) {
          super(authentication);
        }

        public boolean isTeamMember(Job job) {
          //very interesting logic
        }

        @Override
        public Object getFilterObject() {
          return this.filterObject;
        }

        @Override
        public Object getReturnObject() {
          return this.returnObject;
        }

        @Override
        public Object getThis() {
          return this;
        }

        @Override
        public void setFilterObject(Object obj) {
          this.filterObject = obj;
        }

        @Override
        public void setReturnObject(Object obj) {
          this.returnObject = obj;
        }
    }

As you can see I have custom defined method called isTeamMember. This method is successfully evaluated by the following pre authorize annotation: @PreAuthorize("isTeamMember(#job)") but unfortunately it is not resolved as the Spring SpEL function.

see the warning

Is there any Spring Bootish automagic way to register isTeamMember as SPeL function?