People have done something like this this. Back before echo had thermostat control, some community members used a virtual dimmer and mapped it to thermostat settings.
If you use harmony, you can create an activity that puts the volume up five times and then have echo run the activity.
But there’s no way to directly change echo commands to commands for other devices.
A virtual dimmer is probably your best starting point for any device that you have granular control of, for example if you were using a global cache to control IR devices.
Here’s the older thermostat example. This method is no longer needed since echo added native controlled thermostats. But the same principles would apply.