How to default Rate for one plan based on Enrollment in other plan

Hello Team,

We have Medical and Health Savings Account plan.

HSA has 3 options,

1. Employee Only (EE & ER Contribution)
2. Employee + Dependents (EE & ER Contribution)
3. Employee Zero Contribution (Employee contribution is zero but Employer is either $750 or $1500)

Rate for Employee Zero Contribution should be decided based on the enrollment in Medical plan, for example, if Employee chooses, Employee only option in Medical then the Employer contribution for HSA - Employee Zero Contribution option is $750 and with other options, it will be $1500.

Please confirm if this requirement can only be achieved through rate formula and not through setup.

Note: I tried enrollment in other option in plan in eligibility but it doesn't work for new hires but works for enrollments after new hire