Hi @Andrei_Kharlanov and welcome to the Coda Community!
I’ve been meaning to create a public sharable version of the “Global Blocks” system I’ve created for our internal use. Your question helped me finally get that done today.
Here is how I’ve created what I call “Global Blocks” to manage Button Labels, Blocks (footers, larger text blocks, etc.) and Variables (Links, short text content, etc.)
You should be able to copy this Doc to your own account to play with and expand upon it.
Please LMK if you have any questions.