Display nested attribute

Configuration Frontend
1

Hi guys,
I have a sensor with some nested attributes which looks sort of like this:
image
I want to display this sensor in a multiple entity row like this:
image
Is there an easy way to configure this in YAML? So far I tried something like this, but this isn’t working it seems. I suppose the “.” in the attribute name is not possible. Is there any other way, without creating template sensors?

  - entity: sensor.somesensor
    attribute: attribute.subattribute
    type: custom:multiple-entity-row
    entities:
    - attribute: attribute.subattribute2
2

No.