Thanks a Lot Folks! 
You Guys Rocks
Still with a few redundancies and somewhat ambiguous (e.g. I don’t get how a task in today’s journal is not created today), but otherwise very helpful. This attempt is commented:
mentaloid, i’ve tested your query but for some reason it didn’t worked as expected, it ended just showing the the A priorities tasks and forgot all the other ones. I’m really grateful for your time and efforts toward this
Siferiax, your query almost worked out-of-the box !! For some reason I had to disable the
[?block :block/deadline ?dd]
to make it work properly, if i kept it in the code it would show scheduled tasks for the future, so I make it as a comment and the query it’s already functional, since I do not use the deadline function.
But I’m so close to the final result that it makes me super happy
This is what i’ve done, took the Siferiax approach and added a comment on the line mentioned
#+BEGIN_QUERY
{
:title [:h6 " 📝Task Scraper"]
:query [:find (pull ?block [*])
:in $ ?today
:where ; scan everywhere for all
[?block :block/marker ?marker] ; blocks of specific markers
[(contains? #{"LATER" "TODO" "DOING" "WAITING"} ?marker)]
(or-join [?block ?today] ; which are either
[?block :block/priority "A"] ; any top-priority blocks
(and ; or blocks that are
[?block :block/path-refs ?br2]
[?br2 :block/name "tasks"] ; tasks
(not ; not
[?block :block/path-refs ?br1]
[?br1 :block/name "ignore"] ; ignored
)
(or-join [?block ?today] ; and either
(and
[?block :block/scheduled ?sd] ; scheduled for
[(<= ?sd ?today)] ; before tomorrow
)
(and ; or
[?block :block/deadline ?dd] ; ending
[(<= ?dd ?today)] ; before tomorrow
)
;or not scheduled and not deadlined
(not
[?block :block/scheduled ?sd]
;[?block :block/deadline ?dd] ; Made the fix here to make it work
)
)
(not ; but not
[?block :block/page ?j] ; Located on page
[?j :block/journal-day ?today] ; today's journal
)
)
)
]
:inputs [:today]
:result-transform (fn [result]
(sort-by
(fn [h]
(get h :block/priority "Z")
)
result
)
)
:collapsed? false
:breadcrumb-show? false
}
#+END_QUERY