How to close a blog from indexing for regional subdomains in modx?

Question

MODX

Made a blog for a commercial site with regional subdomains. Regional subdomains are configured using the SEODomains plugin. You need to close the blog from indexing on all subdomains either through robots.txt, or insert the noindex tag for the blog pages of subdomains. There is a solution? Tell me pliz

Answer 1

Solved by inserting noindex tag via js. Solution:
if (window.location.hostname.length > "seo-dranitsyn.ru".length) {
let meta = document.createElement('meta');
meta.name="robots";
meta.content="noindex, nofollow";
document.head.appendChild(meta);
}