Replaceable pieces of content

[square-foot]

Hi
Not sure if this has already been implemented and that I am merely unaware of it.

I sorely miss an easy way to change some critical values in the ongoing documentation. For e.g. I may want to change the pricing of my product (for which I am writing the docs) Instead of searching and replacing the information regarding pricing everytime I change it, there could be some "value placeholder" and a separate configuration containing "name-value" pairs. So if I write (as an example) <:pricing:> in various parts of the book, then before publishing Gitbook could search for the key "pricing" from the configuration where the name-value pairs are listed, and use the value stated for that key for the final published version. That way I can change the critical value only at one place.

This would make a nice product even greater. Thanks for reading till here.