Can I have all learning suggestions collected, then put in a report and sent daily to an email address "automatically" ?

Better use a REST API to generate a report and then the REST API Server can send the email. I think that some SIEM systems can also do this:

https://support.f5.com/csp/article/K80004017

https://support.f5.com/csp/article/K58082590

Also see:

https://clouddocs.f5.com/cli/tmsh-reference/v15/modules/analytics/analytics_asm-learning-suggestions_report.html

https://clouddocs.f5.com/api/icontrol-rest/APIRef_tm_analytics_asm-learning-suggestions_report.html