The phrase "in their capacity as such" can be phrased differently to convey the same meaning, depending on context. One alternative is "in their official roles," which emphasizes the formal nature of their position or authority. Another option is "acting in their capacity," which suggests that the individuals are taking on a particular role or responsibility for a specific task or situation. "In their professional capacity" is another synonym, emphasizing the individuals' expertise or specialized knowledge in a particular field. Overall, these phrases are useful for highlighting the specific roles or responsibilities of individuals within a particular context.