I think you can read this Choice component MULTI-SELECT: now a dream, soon a reality? - #18 by Roldy
Also you can try and copy this app Multiselection and Preset (glideapp.io)
It’ very clearly describe solution for you.
I havent remember Glide own video, just some folks videos.
Also you can copy my template and explore trick
Tab-Multiple selection in submission · Glide
https://www.vidline.com/share/V0WRHL43GM/4f3e0c018df69c28ca8ce7073279da24