Search and extract element located in various path of json structure - jsonb

Question

I have a json in a PostgreSQL database and I need to extract an array not always located in same place.
Problem
Need to extract array choicies of a particular element name
Element name is known, but not where he's sitting in structure
Rules
All elements name are unique
choicies attribute could not be present
JSON structure
pages : [
{
name : 'page1',
elements : [
{ name : 'element1', choicies : [...]},
{ name : 'element2', choicies : [...]}
]
}, {
name : 'page2',
elements : [
{
name : 'element3',
templateElements : [
{
name : 'element4'
choicies : [...]
}, {
name : 'element5'
choicies : [...]
}
]
}, {
name : 'element6'
choicies : [...]
}
]
},{
name : 'element7',
templateElements : [
{
name : 'element8'
choicies : [...]
}
]
}
]
My try to extract elements by flatten the structure
SELECT pages::jsonb->>'name',
pageElements::jsonb ->> 'name',
pageElements::jsonb -> 'choicies',
pages.*
FROM myTable as myt,
jsonb_array_elements(myt.json -> 'pages') as pages,
jsonb_array_elements(pages -> 'elements') as pageElements
Alas column choicies is always null in my results. And that will not work when element is located somewhere else, like
page.elements.templateElements
page.templateElements
... and so on
I don't know if there is a way to search for a key (name) wherever it's sitting in json structure and extract an other key (choicies).
I wish to call a select with element name in parameter return choicies of this element.
By instance, if I call select with element name (element1 or element4 or element8), choicies array (as rows or json or text, no preference here) of this element should be return.

Answer 1

Wow! Solution founded goes belong expectation! JSONPath was the way to go
Amazing what we can do with this.
SQL
-- Use jsonpath to search, filter and return what's needed
SELECT jsonb_path_query(
myt.jsonb,
'$.** ? (#.name == "element_name_to_look_at")'
)->'choices' as jsonbChoices
FROM myTable as myt
Explanation of jsonpath in SQL
jsonb_path_query(jsonb_data, '$.** ? (#.name == "element_name_to_look_at")')->'choices'
jsonb_path_query : posgresql jsonpath function
jsonb_data : database column with jsonb data or jsonb expression
$.** : search everywhere from root element
? : where clause / filter
# : object return by search
#.name == "element_name_to_look_at" : every object name equals element_name_to_look_at
->'choices' : for each object returned by jsonpath, get choices attribute
Final version
After get choices jsonb array, we return a dataset with every choice.
choices arrays look like this :
[{value:'code1',text:'Code Label 1'}, {value:'code2',text:'Code Label 2'},...]
SELECT choices.*
FROM (
-- Use jsonpath to search, filter and return what's needed
SELECT jsonb_path_query(myt.jsonb, '$.** ? (#.name == "element_name_to_look_at")')->'choices' as jsonbChoices
FROM myTable as myt
) choice,
-- Explode json return array into columns
jsonb_to_recordset(choice.jsonbChoices) as choices(value text, text text);