Elasticsearch Alert Handling fields with dots

Elastic Search
1

How do I reference a field with dots/periods in it like the 2 below

SNMPv2-SMI::enterprises.99999.1.2

SNMPv2-SMI::enterprises.99999.1.5

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Source IP Address: {{_source}}{{SNMPv2-SMI::enterprises.99999.1.2}}

Message {{_source}}{{SNMPv2-SMI::enterprises.99999.1.5}}
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2

I ended up Renaming the fields in a mutate to get rid of the dots