Populating Form Fields

I would like to create a form for front-end editing of posts (actually a custom post type). In order to do so, when opening the page where the form is shown, I need to populate the form fields with the values of the specific post to be edited.

Is there some event/filter I can use when the form loads to get the post data from the database and populate the form fields accordingly via code ? Or is there some other way this can/should be done ?

I am aware of the caldera_forms_render_get_field filter, however this is per field while I am looking for something in the form level.