trial lawyer: bogado litigante
"Trial counsel means an attorney who presents all or a substantial portion of a case or proceeding to the court or jury."

"Trial counsel means the attorney who represents the defendant"

https://www.lawinsider.com/dictionary/trial-counsel#:~:text=...

Councel : one or more of the lawyers taking part in a legal case

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Note added at 16 ore (2022-11-18 14:25:41 GMT)
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1. "Counsel", not "Councel"
2. "Abogado", not "bogado"

Sorry for the typos!

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Note added at 17 ore (2022-11-18 14:30:02 GMT)
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Abogado Litigante
El que defiende una causa ante un tribunal en su propio nombre o en representación de otras personas.

https://www.lexivox.org/packages/lexml/mostrar_diccionario.p...

contrario: abogado postulante

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Note added at 22 ore (2022-11-18 19:54:47 GMT)
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"Of counsel is the title of an attorney in the legal profession of the United States who often has a relationship with a law firm or an organization but is neither an associate nor partner. Some firms use titles such as "counsel", "special counsel", and "senior counsel" for the same concept. According to American Bar Association Formal Opinion 90-357, the term "of counsel" is used to describe a "close, personal, continuous, and regular relationship" between the firm and counsel lawyer.[1] In large law firms, the title generally denotes a lawyer with the experience of a partner, but who does not carry the same workload or business development responsibility.
The title may be used in a number of situations, including:[2]

Lawyers who have useful experience for a firm (such as knowledge of a particular "niche" practice area) but do not generate enough business to warrant promotion to partnership
Senior lawyers seeking relatively low working hours, billable hours and revenue generation requirements
A part-time practitioner who practices law in association with a firm, but on a basis different from that of the mainstream lawyers in the firm
A retired partner of a firm who, although not actively practicing law, nonetheless remains associated with it and available for occasional consultation
Lawyers transitioning from corporate or government roles"

https://en.wikipedia.org/wiki/Of_counsel

My suggestion:
Abogado litigante consultor