EDIT Okey, this is a more complete script:

#!/usr/bin/python3
import json
import sys
import xml.etree.ElementTree


def read_file(filename):
    root = xml.etree.ElementTree.parse(filename).getroot()
    return root


# assule we have a list of <quiz>, contained in some other element
def parse_quiz(quiz_element, out):
    i = 1
    tmp = {}
    for child in quiz_element:

        name, value = child.tag, child.text
        if name == 'que':
            name = 'question'
        else:
            name = 'answer%s' % i
            i += 1
        tmp[name] = value
    out.append(tmp)


def parse_root(root_element, out):
    for child in root_element:
        if child.tag == 'quiz':
            parse_quiz(child, out)


def convert_xml_to_json(filename):
    root = read_file(filename)
    out = []
    parse_root(root, out)
    print(json.dumps(out))


if __name__ == '__main__':
    if len(sys.argv) > 1:
        convert_xml_to_json(sys.argv[1])
    else:
        print("Usage: script <filename_with_xml>")

I made a file with following, which I named xmltest:

<questions>
    <quiz>
        <que>The question her</que>
        <ca>text</ca>
        <ia>text</ia>
        <ia>text</ia>
        <ia>text</ia>
    </quiz>
     <quiz>
            <que>Question number 1</que>
            <ca>blabla</ca>
            <ia>stuff</ia>
    </quiz>
</questions>

So you have a list of quiz inside some other container.

Now, I launch it like this: $ chmod u+x scratch.py, then scratch.py filenamewithxml

This gives me the answer:

$ ./scratch4.py xmltest
[{"answer3": "text", "answer2": "text", "question": "The question her", "answer4": "text", "answer1": "text"}, {"answer2": "stuff", "question": "Question number 1", "answer1": "blabla"}]

I assume your Ubuntu has python installed

#!/usr/bin/python3
import xml.etree.ElementTree
import io
import json

d = """<quiz>
        <que>The question her</que>
        <ca>text</ca>
        <ia>text</ia>
        <ia>text</ia>
        <ia>text</ia>
    </quiz>
"""

 

s = io.StringIO(d)
# root = xml.etree.ElementTree.parse("filename_here").getroot()
root = xml.etree.ElementTree.parse(s).getroot()
out = {}
for child in root:  #
    name, value = child.tag, child.text
    out[name] = value
    
print(json.dumps(out))

save it and chmod to executable you can easily modify to take a file as input instead of just text

I assume your Ubuntu has python installed

#!/usr/bin/python3
import io
import json
import xml.etree.ElementTree

d = """<quiz>
        <que>The question her</que>
        <ca>text</ca>
        <ia>text</ia>
        <ia>text</ia>
        <ia>text</ia>
    </quiz>
"""

s = io.StringIO(d)
# root = xml.etree.ElementTree.parse("filename_here").getroot()
root = xml.etree.ElementTree.parse(s).getroot()
out = {}
i = 1
for child in root:
    name, value = child.tag, child.text
    if name == 'que':
        name = 'question'
    else:
        name = 'answer%s' % i
        i += 1
    out[name] = value

print(json.dumps(out))

save it and chmod to executable you can easily modify to take a file as input instead of just text