@Rmb : Thank you very much !
(for the link : Support Eva smart whole-household energy meter - #4 by user3951 ).
It seems to work with the Advanced Virtual Device as sensor Gasmeter.
From this real district heating measuring device(Warmtelink) from smartgateways (app & manufacturer) :
With some flows doing the calculations (GJ value *32.68 m3/GJ here in NL/Vattenfall) and calculating and updating the (advanced Virtual device ) gas sensor values every 150 seconds to this :
And finally I have this in the Energy Tab although I have district heating in GJ and not a real gas supply at all/usage with m3 
The price for 1 GJ is currently at Vattenfall NL (district heating) 40,97 € . So the gasprice per 1 m3 is around 1,254 € (=40,97€/GJ / 32,68GJ/m3 = 1.25€ / m3. That has to be configured in the settings of the Homey energy tab) incl VAT excluding basic infrastructure costs 827,90€ yearly
so thank you. 
