Can I use the Transaction attribute in the `AbstractRoutingConnectionFactory` implementation?

Question

I am building a service using Spring WebFlux, R2dbc, and Jasync. As I am considering various databases in the current service, I want to use different ConnectionFactory for each package.

So, I tried to create an AbstractRoutingConnectionFactory implementation and branch it from determineCurrentLookupKey method to a different ConnectionFactory with the package name. Like this.

public class CustomRoutingConnectionFactory extends AbstractRoutingConnectionFactory {
    @Override
    protected Mono<Object> determineCurrentLookupKey() {
        return TransactionSynchronizationManager.forCurrentTransaction()
                                                .map(this::getR2dbcKeyByPackage);
    }
    
    private String getR2dbcKeyByPackage(TransactionSynchronizationManager transactionManager) {
        if (transactionManager.getCurrentTransactionName()
                              .contains(SomeR2dbcProperties.BASE_PACKAGE)) {
            return SomeR2dbcProperties.KEY;
        } else if (transactionManager.getCurrentTransactionName()
                                     .contains(OtherR2dbcProperties.BASE_PACKAGE)) {
            return OtherR2dbcProperties.KEY;
        }
        throw new RuntimeException("not supported package: %s");
    }
  
  ...
}

I tried to compare the package name with the method name used for Transactional annotation in Transaction attribute (definition).

I didn't know for sure about this, but I thought I could use the information here because I could access the TransactionContext using the TransactionSynchronizationManager.

By the way, there is no information about Transaction like the picture below. The picture below shows the part that I checked after running the method with Transactional annotation.

enter image description here

TransactionDefinition is used in the doBegin method of R2dbcTransactionManager, so is there any way to use it in the determineCurrentLookupKey method?