Task chaining is not yet available in the user interface of Qlik Sense Enterprise SaaS, but it is possible to accomplish through the API's.
One such example is the Task Chaining with qlik-cli found at qlik.dev, that example does however require the user to handle the scheduling themselves and also somewhere to execute the API calls .
The attached document will instead showcase an example of how to configure task chaining without an additional server and utilize the schedules defined in Qlik SaaS. It will be running in AWS Lambda and rely on one of the webhooks available in Qlik SaaS in combination with the Qlik RESTful Reloads API.
Schedule/reload any app in a chain through the SaaS Hub and rest of the chain will execute as defined.