Nap trianing

My 8 month old sleeps 11 hours at night and I’m able to put her down awake and she will sleep on her own. Naptime is a different story she will only nap on me, I can’t put her down she will scream non stop for hours if I do. I tried to sleep train her and she starts rolling over in her crib. She will scream for hours. I go in to soothe her without picking up up and it doesn’t work. I’m losing my mind because I don’t even get 5 mins to myself because she naps on me. She has a nested bean sleep sack, white noise machine, and blackout curtains so it’s dark and quiet with white noise. She is not overtired or undertired, she just refuses to nap in there. I want to nap train her but how can I do that if she screams for hours, even if I try to sooth her. Btw, she won’t nap in her swing, any anywhere else. Don’t suggest napping anywhere else besides her crib because that’s the only place I want her to nap.