I didn't understand what you want exactly, but Meraki has a vast list of APIs that you can consult in the link below.
https://developer.cisco.com/meraki/api-v1/get-network-sm-user-softwares/
But as far as I know there is no way for you to install an app on a device with the APIs available for Meraki MDM.
I am not a Cisco Meraki employee. My suggestions are based on documentation of Meraki best practices and day-to-day experience.
Please, if this post was useful, leave your kudos and mark it as solved.