If you want to apply conditional validation on 'Country Code' or 'City' then you need to add this input as 'India'.
{{addressinfoForm.controls?.countryName?.errors?.alpha.message}}
If you want to apply conditional validation on 'City' then you need to add 'Country Name' input as 'India'.
Conditional Expression with type 'string'
{{addressinfoForm.controls?.cityName?.errors?.alpha.message}}