Starting with the release of Strategy ONE (March 2024), dossiers are also known as dashboards.
1. In Strategy Web, create a dossier which contains one date-related attribute and a metric.
2. Create a visualization using the in-built KPI visualization on the dossier with the objects mentioned above, as shown below:

Observe that on formatting, "Previous Value" label appears.
3. In Developer, find the Dossier, right mouse click on it, and select "Translations"; note that the ‘Previous Value’ label is not present, as shown below:

An enhancement request has been opened with the Technology team and has been addressed to Strategy 2021 Update4; upgrade to this version, to take advantage of the fix.