You can use the following APIs to insert KPI values into the system. 

The PUT request used for inserting KPI values:

 /api/v1/KpiIntegration/values

The PUT request used for inserting KPI  targets:

/api/v1/KpiIntegration/targets

The PUT request used for inserting KPI  baselines

/api/v1/KpiIntegration/baselines

The PUT request used for inserting KPI  actualsForecast:

/api/v1/KpiIntegration/actualsForecast

The PUT request used for inserting KPI  customTargets:

/api/v1/KpiIntegration/customTargets