I looked into this general question about a month ago and came up with some information that seems a bit more hopeful than the previous responses here. Here's the post.
[post|667785|SOLVED: How do I delete. " this setting is managed by your administrator"? - Acer Chromebook cb3-532-c47c - iFixit|new_window=true]
Part of that question had to do with connecting an Android phone to a Chromebook which isn't relevant here, so I've copied the part that's of interest to you.
[quote]If you're being restricted by an Administrative policy, you'll need to remove the Chromebook from the managed network. Outside of contacting the network administrator, the only other way to do it is to wipe it completely, assuming the “forced re-enrollment” setting is not enabled (which it is by default). It's also possible that Developer Mode that's used to wipe the computer is blocked by your administrator. See "[link|https://platypusplatypus.com/chromebooks/how-to-reset-a-managed-chromebook/|How to Reset a Managed Chromebook (School, Work, or Enterprise) - Complete Tutorial (2022)|new_window=true]" for the complete set of instructions.[/quote]