Consider this scenario:
CPT: Practice Area
Taxonomy: Category (the built-in category taxonomy)
Requirement: When viewing single practice area CPT posts, show 4 random posts (the regular blog posts) that are assigned to the same category/categories as the current CPT.
Here’s how query loop can be set in Bricks to show related posts by a taxonomy’s terms:


Reference: Posts Related by Current Post’s Terms in Bricks.
If your category names have commas or other special characters, follow Related Posts by Taxonomy in Bricks instead for a more robust solution.