Password generation based on pattern

I think, password generation based on selected by user pattern, will be nice to have feature. I’ve seen that option in KeePass, but i’ve never seen that feature in any mobile or www password manager.

For example will be nice to set up passwords generating in format “UUSDDDD$LL”, where U is upper case character, L is lower case character, S is special character and “$” is dolar sign.

Password generation based on pattern in KeePass:
https://keepass.info/help/base/pwgenerator.html