If you are able to convert those metrics to format readable for Dynatrace (for example as custom network device with custom metrics via api) there will be no problem with such operation. But you have to remember that for plug-in and api approach you will need free custom metrics in your license. Here you have my question about how this is calculated.
As far as I know, there is an extension in the works which will enable you to collect Prometheus metrics and store them in Dynatrace as custom metrics.
At the moment, you still need to write a OneAgent or ActiveGate plugin to pull metrics from an exporter and send it to Dynatrace. It requires a little bit o Python knowledge, but it's simple.
If you have OneAgent running on the host where the entity is being monitored and where the exporter is located - you should go with OneAgent plugin. If it's some kind of a remote host/device, you might want to write an ActiveGate plugin.
Also - if this fits your use case, you can also push metrics via API to Dynatrace.