Dynamic time trigger of notification from waze

I’ve got a waze integration which tells me how long it takes me to get to work.

I’ve also setup Alexa integrations already so I can notify me of various things via automations

I’m trying to use the Waze ‘how long it takes to get to work’ variable plus ten minutes, so that I get a notification on my Alexas 10 minutes before it’s time to leave for work but I can’t figure it out :frowning:

TIA