Unfortunately, I’m not aware of any standard to be used as a reference for the definition of KPI’s.
KPIs should be a function of the strategic orientation of an organization. Simplifying a complex world, an organization can serve clients that value above all:
The lowest price; or
Innovation or design; or
If an organization manufactures a product or provides a service focused:
on customization, the point is not efficiency but effectiveness;
on the lowest cost, the point is efficiency.
Some years ago, I developed this crazy metaphor of seeing an organization with all its processes as an athlete. If you compare the body of someone competing on athletics with the body of someone that competes on weightlifting, they are very, very different. The body of a soccer player is very different from the body of a basketball player. Different strategic orientations require different process content. Two different organizations with two different strategic orientations may have a process with a similar name but with different activities or different priorities.
The following material will provide you more information:
Free webinar on demand - Measurement, analysis, and improvement according to ISO 9001:2015 - https://advisera.com/9001academy/webinar/measurement-analysis-and-improvement-according-to-iso-9001-2015-free-webinar/