Hi @AdamMoore, Good day!
Turned out that we cannot use this showFlag function in our use case. Basically the idea is, using Forge trigger we declare a function inside src/index.js that will listen to Jira events, eg. Create issue, update issue, etc. and inside the function we will send request to our Third-party Web API, depending on the response we will show a notification message but turned out @forge/bridge cannot be accessed inside the src/index.js.
I also came across on this discussion which is related with this https://community.developer.atlassian.com/t/cant-deploy-forgui-with-forge-bridge-component/47246/14
My question is, is there any alternative that we can use in our case to show notification message?