[Gauge, Goal] [Split Group] the label is not displayed for field types other than "number".

[alexwizp]

Kibana version:
master, 7.9??, 7.10

Describe the bug:
[Gauge, Goal] [Split Group] the label is not displayed for field types other than "number".

Steps to reproduce:

1. Install a sample data and create a new Gauge visualization
2. Add new Metric
   
3. Add new Bucket: aggregation: Terms, field type: Date
   

Expected behavior:
I expect to see serialized value for label. Visualization cannot be used in its current view

For numbers it looks like:

Horizontal bar visualization draws labels in a better way for the same configuration:

[elasticmachine]

Pinging @elastic/kibana-app (Team:KibanaApp)

[alexwizp]

Looks like we hide that labels if chart item has small size. I agree with this behavior for a single chart element, but it's pointless for split data.

@timroes @stratoula any ideas?

[stratoula]

Well yes I agree this visualization without any label can't be very helpful for the user. It happens on small screens though.

We could possibly make the labels text size responsive instead of hiding them but I would love the feedback from the design team. @miukimiu what do you think about it?

[elasticmachine]

Pinging @elastic/datavis (Feature:ElasticCharts)

[timroes]

cc @markov00 Since I don't think we should address that anymore in the vislib implementation and instead make sure Elastic Charts is behaving exactly the way we would want this to behave.

[markov00]

@timroes the current implementation (that was released in @Alpha at the beginning of this year) actually scales the font depending on the chart size.

[timroes]

I'd close this issue then in favor of #56143, since I don't think we want to address that in the vislib implementation before switching over.