Works perfect !!
SELECT
BILLCHARGE_ID,
EXT_ATTR,
json_extract(replace(replace(replace(EXT_ATTR, '{', '["'), '}', '"]'), ',', '","'), '$[9]') AS EXPRESION,
replace( substr( substr(EXT_ATTR, instr(EXT_ATTR, '(') + 1), 1, instr( substr(EXT_ATTR, instr(EXT_ATTR, '(') + 1), ',') - 1), ')', '') EXPRESION2
FROM BILL_CHARGE WHERE BILLCHARGE_ID=751000000157777658
BILLCHARGE_ID EXT_ATTR EXPRESION EXPRESION2
751000000157777658 {,,,,,,,,,(11)24598458,100230,,1} (11)24598458 1124598458
Thanks you all!!