Post-Job Force Full weekly script
Regular chaining of Backup Plans does not allow to schedule a Full of the chained Backup Plan and this is an important option for Image Based Backup Plans. However using a Powershell script to chain plans can help you achieve the desired setup.
In order for this solution to be implemented please make sure your setup meets the requirements from here
Below is an example of the post job script doing exactly that:
powershell -command "Start-MBSBackupPlan -Name 'Image-Based to Cloud' -ForceFull -ForceFullDayOfWeek 'Friday' "
You can replace "Friday" with another day of the week and replace "Image-Based to Cloud" with name of chained backup plan.
This solution was tested to work only if second plan has no schedule on its own.