MWRD : 
=substitute(TRIM(index(importxml("https://www.boursorama.com/bourse/trackers/cours/1rTMWRD/";"//div[@class='c-ticker__item c-ticker__item--value']");1;1));".";",")

CW8 :
=substitute(TRIM(index(importxml("https://www.boursorama.com/bourse/trackers/cours/1rTCW8/";"//div[@class='c-ticker__item c-ticker__item--value']");1;1));".";",")