CSQL as a Linked Object in CTAs

Hello CSQL product manager

We are currently using the GS Opportunity object, attached as a Linked Object to CTAs. This allows us to capture timeline entries related to the CSQL.

However, I really like the CSQL feature better and want to switch over. But I noticed you cannot add the GS Lead object into Linked Objects. Again, we want to allow for timeline activities to be attached to the CSQL, and CTA is a decent place for it.