Domoticz value to Homey Virtual device?

On my Synology NAS I run Domoticz, which reads out the use of electricity, gas and water. I know it is possible to visualise these values in Homey, by setting the right capability of a Virtual Device:

In Domoticz I run a script that calculates the cost of the used electricity / gas and water. I would like to see that value in Homey too! Is that possible? I tried it with a Virtual device, but get stuck choosing the capability.

Thanks!

Maybe this Tutorial: Device Capabilities - Homey Apps SDK v3 can help.

Thanks @DaneedeKruyff
I will pick a capability from a sensor and (mis)use that.

Thanks!