Can I add CODE execution to CMS? (like an external form/script)?

I have external forms I would like to add to certain pages (but using the dynamic content)

so with the image, icon, title…
I would like to add code …
can I do this?

I see there is ‘plain text’ and ‘rich text’
but this doesn’t tell me it will execute an iframe or script or even a link ( yes I know you have link option)

Thanks please let me know asap