name: Welcome Bot
config:
  - name: WELCOME_MESSAGE
    friendly_name: Welcome message
    type: text
    default: Welcome to the Slack!
    global: false

name: Welcome Bot
config:
  - name: WELCOME_MESSAGE
    friendly_name: Welcome message
    type: text
    default: Welcome to the Slack {}!
    global: false

Add {} to default message
Add {} to default message
