Gradually increase tempo within a measure?

In the pickup measure for a song I’m working on right now, I want to gradually increase the tempo from the start of the measure (50 bpm) to the end of the measure (80 bpm). That final tempo (80 bpm) if the tempo for the remainder of the song until the very last measure, which I would want to reverse so that the last measure slows gradually from 80 bpm down to 50 bpm. As far as I can tell, that’s not possible right now, so I’d love to request that feature in the future if possible.

Please let me know if any part of this doesn’t make sense!

Thank you,

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