How to get plugin config variable inside custom-element twig file?

[yurii.k]

Hi, guys!
Have a question:
When I set some config variable in my plugin I can get it in twig-template like this:

{{ config('MY_PLUGIN.config.MY_VARIABLE') }}

It works on storefront. But how can I get it on administration side, when I configuring my custom element?

Thanks a lot!