Is it possible to have a CNAME DNS record point to a URL with a path?

I've registered several domains for my nieces and nephews, the idea being to create small static webpages for them, so they can say 'look at my website!'.

In terms of hosting it, I'm using expressjs on Heroku, to serve up static pages.

What I'm wanting to do is have:

http://suzy-derkins.space        -->    my-herokuapp.herokuapp.com/static/suzyhttp://calvin-is-trouble.space   -->    my-herokuapp.herokuapp.com/static/calvin

Now I can user a CNAME record to point each of my domains at my-herokuapp.herokuapp.com, but a CNAME record won't allow a full URL.

I could add an unmasked redirect, so that

http://suzy-derkins.space redirects to https://suzy-derkins.space/static/suzy, but that's ugly.

I don't want to use a masked URL redirect - as that causes problems on mobile, and also the user presses any links, the new page remains masked.

I'd also like to retain the ability to add additional pages, for example:

http://my-herokuapp.herokuapp.com/static/suzy/my-favourite-things be represented by http://suzy-derkins.space/my-favourite-things.

What kind of records do I use to do this?