I'm using replace(yourText,base64ToString('DQ=='),yourValue) to replace CR (\r) so perhaps concat(yourvalue1,base64ToString('DQ=='),yourvalue2)?
replace(yourText,base64ToString('DQ=='),yourValue)
concat(yourvalue1,base64ToString('DQ=='),yourvalue2)
LF (\n) is base64ToString('Cg==')
CRLF (\r\n) is base64ToString('DQo=')