Function Variables are very useful. Since my garage opener is not on Stringify I combined it with IFTTT using this variable.
When the garage is open IFTTT trigger this flow and set the 'garage open' variable to 'True'. And 2nd flow with same variable is set to false when the garage is closed. Then I use that variable 'garage open' on several other flows. For instance IFTTT turns my light to Red when garage is open. When there's motion on my Ring Stickup Cam lights turn Blue. But with this variable I'm able to keep Left light Red indicating that the garage is still open.
Hope this helps.