But you wrote:
And the capabilities von Relay 1 are not visible in the screenshot.
However, if I understand you correctly, at the moment it’s only possible to switch the entire Universal Relay on or off, which also switches relays 1 and 2, correct?
Theoretically, it should be possible to “clone” the Universal Relay including the 2 relays with the Device Capabilities app. For that you have to create a so called Advanced Virtual Device with this app.
Device Class: Other (Default)
Create button
Name: Universal Relay (e.g.)
Create a real field and flow cards: 
Show as: On/Off
Symbol: whatever
Reflect: Devices (choose the UR)
Property: On/Off of the UR
React (set properties):
Create button
Name: Relay 1 (e.g.)
Create a real field and flow cards:
Show as: On/Off
Symbol: whatever
Reflect: Devices (choose the UR)
Property: On/Off of Relay 1
React (set properties):
Create button
Name: Relay 2 (e.g.)
…
Hope I made no mistakes.
If you have questions about creating this AVD, you can ask in this topic:
Even if it works with an AVD you should contact the app developer as already suggested by @Peter_Kawa.
