docs: public void fromYamlFile(File yamlPolicyFile) throws IOException, ChaincodeEndorsementPolicyParseException {
          final Yaml yaml = new Yaml();
          final Map<?, ?> load = (Map<?, ?>) yaml.load(new FileInputStream(yamlPolicyFile));
  
          Map<?, ?> mp = (Map<?, ?>) load.get("policy");
  
          if (null == mp) {
              throw new ChaincodeEndorsementPolicyParseException("The policy file has no policy section");
          }
  
          IndexedHashMap<String, MSPPrincipal> identities = parseIdentities((Map<?, ?>) load.get("identities"));
  
          SignaturePolicy sp = parsePolicy(identities, mp);
  
          policyBytes = Policies.SignaturePolicyEnvelope.newBuilder()
                  .setVersion(0)
                  .addAllIdentities(identities.values())
                  .setRule(sp)
                  .build().toByteArray();
      }