Customise the help features of Sugar

Dear Sugar Community, 

I'm wondering if anyone has been able to extend or customise the help functions within Sugar. In particular the Help button and the callout at the bottom right in the footer. i.e. 

I'm looking do the following, if possible: 

  1. Add specific help text
  2. Insert another link to some in-house video tutorials. 
  3. Add additional information to the "Tour this page" feature. 

Any ideas of assistance would be appreciated. 

SugarCRM Version 11.0.0 (Build 238 P) (Q2 2021) on Premise.