sungod has it nailed
in python the code below will do what OP is looking
import meraki
API_KEY = "API-KEY-HERE"
dashboard = meraki.DashboardAPI(API_KEY,suppress_logging=True)
response = dashboard.networks.getNetwork(
network_id
)
#This looks for existing tags and stores it into local variable
updated_tags = response['tags']
#Below adds two tags.
updated_tags.append('WIFI')
updated_tags.append('NEW YORK')
#Finally update the network with the tag. Keeps the existing tags and adds the two I mentioned.
response = dashboard.networks.updateNetwork(
network_id,
tags=updated_tags
)
print(response)