Before uninstalling, try resetting:
https://support.google.com/chrome/answer/3296214?hl=en-GB
(That will retain your bookmarks)
If you really want to uninstall Chrome, see here:
https://support.google.com/chrome/answer/95319?co=GENIE.Platform%3DDesktop&hl=en
Leaving 'Also delete your browsing data' UNCHECKED should retain your bookmarks but it might be wisest to back them up first. See 'Move bookmarks to another browser' here (even though that's not what you're actually doing) for instructions. To re-import them follow the same instructions but select 'Import' instead of 'Export':
https://support.google.com/chrome/answer/96816?hl=en-GB