As I am currently writing my thesis, I would like to show figures, tables, refs ou equations corresponding to an hyperref when hoverring over the hyperlink with the mouse inside the produced PDF as in:

Note: I don't know why but the mouse does not appear on screenshots. It is respectively on 1987 and 2 of figure 2(b).
I looked here where solutions are described. However, Is there any solution that does not require the use of an external script, and is pure latex ? I would imagine a package that enables the preview for all hyperrefs ?
EDIT:
Thanks to @AlexG comments, I managed to get this working for bibliographic entries.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% usage: \autociteTip{<bib key>}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\newcommand{\autociteTip}[1]{%
\autocite{#1}%
\makebox[0pt][l]{%
\tooltip**[black!0]{|}{\parbox[b]{\textwidth}{\fullcite{#1}}}%
}%
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
I have 3 questions remaining :
The pop up appears when the mouse is over the left of the clickable reference, where I'd like it to appear when being over the clickable link (boxed by default in green)
When using
\autocitewith multiple references, only one pop up appears containing all references. Is there anyway to separate it into different ones ? It is somewhat linked to the previous question.
- How can I recover what has been displayed into
equationandfigureenvironment ? I.e how can I define theeqrefso that it displays the related equation ? Same for the figure.

\tooltipcommand used therein is here: https://tex.stackexchange.com/a/164186 – AlexG Mar 28 '20 at 14:55