Hard to input KaTex Math

[idealkindom]

Operating system

Windows

Joplin version

3.1.6

Desktop version info

3.1.6 pre-release

Current behaviour

1.Generally you input a Katex math inside a environment with paired "$", and common function begins with "". In joplin it's a little messy, since you could input"$sin{x}$"to get a descent sine function,while with $\sin{x}$ you get something look bad, which you doulbe click it to find that it become \sin{x}; However,for some other symbols like $\overleftarrow{AB}$ you must input "" to get what it supposed to be, of course for this the syntax is complying with Katex.
2.I tried with many KaTex examples provided in Katex cheasheet and find it's hard to succeed with copying and paste the sample code in paired "$".I attached the Katex supported example file.
Supported Functions · KaTeX.pdf

Expected behaviour

To render Katex math right.

Logs

No response