Creating Links for External Members in Your Slack Community Channel

Hi everyone, I have a Slack question, hoorray! I started a Slack community a few moths ago and I feel I am kind of stuck - lack of knowledge, and maybe Tightknit has the solution here. This is the situation: currently it's a free account with less than 50 members, with a couple of channels. I want to be able to add members from external orgs to 1 specific channel. I want to create a link for that. Is this possible?