Create model KPIs in Power BI Desktop
KPIs can be defined in the Analysis Services model hosted by Power BI, but there's no UI to create them in Power BI Desktop.
The icon sets feature (https://powerbi.microsoft.com/en-us/blog/power-bi-desktop-july-2019-feature-summary/#iconSets) lets you define indicators with logic in the visual itself, but having that logic centrally defined in a model KPI lets you re-use it across visuals and even reports.
James Ward commented
This would be great now that Power BI is moving towards enterprise features (i.e., Shared Datasets)