Add a simple box below all posts already created – Elementor/Hestia

My site was made with Elementor with the free theme Hestia, now I need to add an html box that will have to be present under all the posts already inserted, but I can’t figure out how to do it.

I understand that with the free versions they do not allow this modification, can anyone help me on how to do this?

Is there any plugin that allows to do something like this?



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