Bridging the Gap: Converting LinkedIn Members to Slack Community Joiners

Hi All, we have a significant number of members who are part members of our community in LinkedIn but have not joined our Slack community. I was wondering if there is a way to use Tightknit’s “join the workspace” milestone as part of the onboarding journey? Although if members are checking off onboarding milestones they’ve already joined the Slack community. Has anyone closed the gap between LinkedIn members and gotten them to join your slack community? How did you do it?