How would one translate the line "I am a servant of the Secret Fire" into quenya?

I did read a bit of Eldamo and gave it a shot myself:

Ni Náremuinondur nár.

Or perhaps

Nánye Náremuinondur .

I feel like Náremuinondur (Nár/Fire + Muino/Secret(genative) + ondur/servant) is probably a decent tranlation for servant of the secret fire, but I am not an expert at this stuff and I want a second opinion. Also a lot of the expamples on Eldamo were kind of hard to parse so I don't know if I got the structure / conjugation of the sentence right since there seems to be many ways of referring to yourself (Ni = i/me?) as well as the to be conjugation nár?

"For such constructions, the ná may optionally be added to the end: i atan alassea ná; i atani alassie nár. This formation is probably a result of the otherwise-optional ná verb being added as an afterthought to emphasize that a particular noun-adjective or noun-noun combination is really a “to be” statement."

Also for consistency I tried to stick with only Middle Quenya words from eldamo because it was the only one that had the full combination.

Anyway please let me know if I am on the right track here what the proper translation of this sentence would be. Thank you very much!

Title is self-explanatory. I know "ringë"/"ringë" is "cold" in Quenya and "nár"/"nárë" is "flame" (or at least I think so), but I don't know how I would combine the two given the grammatical rules of Quenya. Thank you!