Simple L2TP Client for Android?

Question

Android

Dear community, Android software vpn client is required (version 5 and above)
Specification:
Free and no ads (or sane app price tag, up to $5-10)
Simplicity.
Support for creating vpn connections via the L2TP protocol (without forced ipsec, this is important!)
For example - strongsWan vpn client, simple free and convenient, but alas, it does not support regular L2tp with login and password, without ipsec bells and whistles.
The matter of finding the right solution is greatly complicated by the fact that 95% of the results in the search results in PlayMarket according to the words "vpn client" are all ready-made vpn solutions, according to the "1-click" principle, where a set of third-party servers is preinstalled. And this essentially nullifies the entire search. What you need is a clean simple vpn client, where you can fill in your server parameters, login and password. Of those that I found, they are mostly either hung with ads, or there is only L2tp in a forced bundle with ipsec.