You can now get Spot Eviction Rates via Azure Resource Graph. More details here: https://learn.microsoft.com/en-us/azure/virtual-machines/spot-vms#azure-resource-graph
Sample query:
spotresources
| where type == 'microsoft.compute/skuspotevictionrate/location'
| where location in ('westeurope','northeurope')
| project skuName=tostring(sku.name), location, evictionRate=properties.evictionRate
| order by skuName