No nested loops in RF; that can be done only by calling a keyword with the inner loop, in the outer one.
In your particular case though, you could go without it - as you want to match the full line, that's doable through Should Contain:
${contents}= Get File ${file path}
@{lines}= Split to lines ${contents}
${matched elements}= Get Webelements ${LABEL PORTAIL XPATH }
: FOR ${element} IN @{matched elements}
${text}= Get Text ${element}
${present}= Run Keyword And Return Status Should Contain ${lines}
${text}
Run Keyword If ${present} Log '${text} matched'
If you were going after a partial match - i.e. ${text}
to be a part of a ${lines}
member, then it wouldn't be possible like this.
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