i tried [ spell ] home brew name [ /spell] but nothing, is there a way to make it like haste]   ?

Yes. Tricky. But Yes.

Quote from Ryvaeus >>

You're going to have to open the source code for the post/homebrew description box (it's the "</>" icon between the Quote and Paragraph buttons in the textbox editor) and type in the link manually.

For example, this:

<a href="https://www.dndbeyond.com/spells/215436-cleansing-orb" target="_blank" data-tooltip-href="https://www.dndbeyond.com/spells/215436-tooltip?disable-webm=1">Cleansing Orb</a>

Will look like this:

Cleansing Orb

Don't mind me, I'm just testing tooltips here.
hawk

Those special links are called “tooltips.” If you take a look at the General FAQ #9, I gave a full walkthrough for how to make false tooltips for homebrewed spells, monsters, and magic items that even look like the regular tooltips: (https://www.dndbeyond.com/forums/dungeons-dragons-discussion/homebrew-house-rules/131411-a-homebrewers-how-to-faq).