Yes, AthleteMonitoring allows you to calculate Acute:Chronic Workload Ratios (ACWR) with both EWMA and rolling averages. Both sRPE load and the metrics collected via ne of the 50 custom fields can be using their own ACWR calculations. This is configured in Team settings.
Calculations methods are explained here:http://support.en.athletemonitoring.com/support/solutions/articles/13000008095-the-team-dashboard
All graphs, alerts, etc. are using the selected calculations methods.