Fluentd Parsing error with JSON and Non JSON ending logs - fluentd

Question

I have a log file where the consecutive lines are coming in different format. one is with JSON object at the end, other is without JSON
Type 1:
2020-01-29 09:38:09 [/] [main] INFO org.springframework.boot.web.embedded.tomcat.TomcatWebServer | | Tomcat started on port(s): 9021 (http) with context path '/service'
Type 2: (With Json in the end)
2020-01-29 09:38:09 [/] [main] INFO org.springframework.boot.web.embedded.tomcat.TomcatWebServer | | Tomcat started on port(s): 9021 (http) with context path '/service' {'key':'value'}
Using the below code in my fluentd.conf to parse the log file
#type tail path /root/logs/my-service.log pos_file
/root/logs/my-service.log.pos tag my-service.log #type
multiline format_firstline /^\d{4}-\d{1,2}-\d{1,2}/ format1
/^(?\d{4}-\d{1,2}-\d{1,2}
\d{1,2}:\d{1,2}:\d{1,2})\s+[(?\w*?(?=/))/(?[^\s])]\s+[(?[^\s]+)]\s+(?[^\s]+)\s+(?.+?(?=[?{)|.)(?.*)/
This format works for the TYPE 2 log format mentioned above, but throwing error with TYPE 1.
As belwo
0 dump an error event: error_class=ArgumentError error="params does not exist"
Since JSON is not available at the end.
How do I handle such scenario, this would be really helpful to fix some ongoing issue in my EFK stack.