Grammar checker for old email and landing page builder

Your software
My Mautic version is:2.16.2
My PHP version is:7.3.31
My Database type and version is:10.4.21-MariaDB

Your problem
My problem is:
I am looking for ways to integrate spell checker to email and landing page builder, I saw that the builder is froala editor, I am sure that there should be a froala spell checker plugin. How can I add spell checker button so that it checks the grammar of the text entered in the fields.

These errors are showing in the log:

Steps I have tried to fix the problem:
I saw that in corebundle/assets/js/froala/plugins - there are a lot of plugins present but are not available in frontend froala editor panel.
Is there any way I can activate those plugins to appear on the froala editor panel. I think it has the spell checker plugin js file as well.

Hi, Mautic 2.16 is not supported anymore, we are working on 4+ version.
The Froala editor is also removed as default editor, now we work with GrapesJsBuilder.

Joey