graylog-labs/graylog-plugin-slack

JMTE formatting upprecase

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Hi! Can I use JMTE formatting to send field content in uppercase?
I've tried in this way ${message.source;string(uppercase)} but it doesn't work. The content is sent as is. No errors.
My env:
graylog-server 2.4.5-1
graylog-plugin-slack 3.0.0
Thanks.