I want to use json data instead of custom objects to store event visit information. The idea is the following :
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If you use a predictable JSON indenting format (more to the point, no indenting or whitespace at all), then even though Marketo can't actually parse JSON internally (for that, you'd use a webhook, and I certainly recommend you do for advanced logic) you can use the Contains operator.
If you use a predictable JSON indenting format (more to the point, no indenting or whitespace at all), then even though Marketo can't actually parse JSON internally (for that, you'd use a webhook, and I certainly recommend you do for advanced logic) you can use the Contains operator.
It looks to me like should be using Custom Activities: https://developers.marketo.com/rest-api/lead-database/activities/#custom_activity_types
Only if you have no need to access the actual contents of the event in an email, which is an implied need if moving from COs.