No, Gregorian chant is characterized by a specific rhythm known as a non-metric or free rhythm, where the timing of the notes is based more on speech patterns than on a regular beat.
There isn't a requirement of rhythm for a free verse poem.
Free verse has variable rhythm.
Donald Davie's "Some Notes on Rhythm in Verse" was first published in 1967.
A poem with no rhythm or rhyme is typically called free verse. This type of poem can also be considered blank verse.
Blank verse is characterized by its regular meter (iambic pentameter) and unrhymed lines. You can tell a poem is written in blank verse by counting the syllables in each line and noticing the natural flow and rhythm without any rhyme scheme present.
a verse
verse is a verse or poem that doesn't rhyme but has a strict rhythm, usually iambic pentameter.
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A Verse
a verse