https://kiis.com.ua/?lang=ukr&cat=reports&id=1249&page=1
69% of Ukrainians want to replace the Rada (parliament) after Ukraine is victorious. 47% want to replace the government. And only 23% want to replace the president. Zelensky is still benefiting from the rally round the flag effect. Putting this in context, Ukrainians are generally quite skeptical of their government and quick to sour on incumbents, so Zelensky is faring pretty well in this respect.
Here's the breakdown by region. Fairly similar across all regions. Note this poll covered all regions except for Crimea and pre-2022 Russian-held Donbas territories. Though sampling might be affected by the Russian occupation.