I used Xano (Xano) not Integromat, but the principal works on both platforms. This video is a little long (16 minutes) because I go from start to finish on it. I made some mistakes at the end that I needed to fix. To make it work you need to make 2 external collections, 1 for the schedules, and 1 for the map data. I hope this makes your project move forward.
Maybe someone with more experience in Integromat would be better to answer this question.
If I remember Integromat, you will need to make 2 scenarios. One for Schedule and one for Maps. Each would have a webhook and a webhook response that will transform the data like I showed in the video.
You need 1 scenario that will convert the data from yuu26 into an array of schedules with start date, end date, and schedule id. scenario 2 will take the yuu26 data and return an array of maps with map image, map name, map id, and schedule id like in the video.
I do not know Integromat well enough to be able to help further.