There would be a few ways to do this, depending on the specifics of what you're trying to do.
JavaScript and/or AJAX. Actually, I don't know if AJAX works on Marketo pages. Never thought about that before.
iFrame. This would be a pretty easy one, but it's a very specific setup. Your blocks will have to be the same height and width, which you iFrame into separate segments. The rich text editor might filter out iFrames by default (again, I haven't checked this), but if that happens, you can do a
text token in the segment that contains the HTML for the iFrame.
You might be talking about a more advanced integration, something along the lines of a SOAP API integration that constantly/automatically updates values for the snippets. In that case, there will be lots of custom coding on your own application end, and then you can just push the changes to SOAP after you've sorted through all the logic on your app's end first.
Best,
Edward UnthankMarketing Operations Specialist
Yesler