No, you can’t. This is due to the difficulty in supporting and adapting the .proto.gz or .tachibk format that Tachiyomi uses. Also Kotatsu and Tachiyomi and its forks have different data structures that they use. For Neko for MangaDex users we recommend to use Nekotatsu.
I been using Kotaksu and so far I love it, actually some of the manga sites that went shut down on Tachiyomi are available there, for now.
Wonder if they will figure out a way to import Tachiyomi backups or series lists now…
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https://kotatsu.app/manuals/faq/general/#can-i-restore-my-tachiyomi
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