This might not be possible out of the box with Trello, however, have you tried copying the multi-item list and pasting it in the first item in a checklist on an existing card?
It should split out the multiple items into their own checklist items. This might be a half-way solution for what you're looking for.
Hard to believe Trello has 100+ power-ups (known as apps for other Atlassian products) to choose from, enabling us collaborate with teams and organize our work and personal lives more efficientl...
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