Hi @milu_balan - that's actually possible through the code, but useless and bad practice. The reason why the maximum length is set to 70 characters is not because Shopify wants to enforce their rules, but because anything more than that will affect you negatively.
I'd recommend you to check this article on Title Tags, especially the section "1. Watch your title length".
I use Google translate
The more you try to go against the principle of search engines, the more likely it is that your website will not increase your rankings, but it will also reduce your site's credibility. It is recommended that you do not need to add lengths of threads to do