New test servion 1.4.6 + 1.4.7:
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Accept line breaks in service flow card:
Line breaks in JSON text caused a service error. Now also linebreaks should work without issues. So you can copy&paste the data part.

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Added device flow cards for dynamic scenes.
HA offers the possibility to create a dynamic scene and store the entity states in this scene. This scene is temporary and is discarded on new configuration load in HA.
This scene can be applied to restore the entity states.
This way you can make a “snapshot” for several entities and reload them later. That’s similar to zone memory app, but managed inside HA.
For standard devices, the main entity is used. For custom and compound devices, all assigned entities are used. You can collect several entities (also lights etc.) in on compound device (e.g. as sensor showing the state) to build a group and use this custom device to store end reload the states of all included entities (e.g. all lights in a room).

Again thanks to @JB2K for the suggestion.