Re: customized link pointing at a src block

["Fraga, Eric" <e.fraga@ucl.ac.uk>]

You want the equivalent of the LaTeX exporter's

,----[ C-h v org-latex-prefer-user-labels RET ]
| org-latex-prefer-user-labels is a variable defined in ‘ox-latex.el’.
| Its value is t
| Original value was nil
| 
|   You can customize this variable.
| 
| 
| This variable was introduced, or its default value was changed, in
| version 26.1 of Emacs.
| 
| Documentation:
| Use user-provided labels instead of internal ones when non-nil.
| 
| [...]
| 
| For headlines that do not define the CUSTOM_ID property or
| elements without a NAME, Org will continue to use its default
| labeling scheme to generate labels and resolve links into proper
| references.
`----

I don't think the HTML exporter has anything similar but it should be
possible to implement...

-- 
Eric S Fraga via Emacs 27.0.50, Org release_9.2.6-552-g8c5a78