If all entries are in the strict format 'M2 USD … BITC … MAD … LOSS …', where the BITC-value is always the fifth part, you can try using a simple split:

SELECT SUM(SPLIT_PART(value, ' ', 5)::float) AS bitc_sum
FROM TABLE(FLATTEN(INPUT => data))

Where data is your array with the values ​​from the question.