NIP-10 says using Markdown or HTML in the text body are not allowed, only plaintext. So I find this website, which generate UTF8 plaintext but adding some style to it, which will be rendered on all clients. Something like
- ๐๐ผ๐น๐ฑ ๐๐ฒ๐ ๐
- ๐ช๐ต๐ข๐ญ๐ช๐ค ๐ต๐ฆ๐น๐ต
- ๐๐ฉ๐๐ก๐๐ ๐๐ฃ๐ ๐๐ค๐ก๐
- Sฬถtฬถrฬถiฬถkฬถeฬถ-ฬถtฬถhฬถrฬถoฬถuฬถgฬถhฬถ