How do I tell my coworkers that I'm suicidal?

Before I start, I'm getting weekly help from my therapist about my suicidal thoughts and I have support from my family. However, I'm still having bad intrusive thoughts that I fight every day

However, I am unsure if my coworkers have caught on to my thoughts or not. My boss has been trying to make me open up to others and I suspect that there will be a time in the near future that I tell them about what's rattling in my head

How do I phrase suicidal thoughts in a professional manner that won't get me in trouble for over sharing, or remove me from the work place over their concern for my safety?