SOTI script to log in user credentials to provision the application
If your app is a modern enterprise-grade app for Android-Enterprise platform, the app should support the industrial standard AppConfig framework to support the provisioning procedure for their enterprise customers. Soti MobiControl support this and your app can take full advantage of this if it also support AppsConfig.
As far as I know, Soti does not have any script to support what you need, and there is unlikely any MDM/EMM/UEM solution on the market have such support. On Soti MobiControl, the best you can do is probably to remote control to EACH device and perform your required procedure manually.